Birds to See in Denmark in April
207 bird species on our list for Denmark are recorded regularly in April
Of these, the most often recorded are Woodpigeon, Chiffchaff, Hooded Crow, Blackbird and Great Tit. New this month: Barn Swallow, House Martin, Blackcap and Willow Warbler and 37 more.
On the move in April
GBIF · AprArriving
At their peak
From Denmark’s bird records, 2019–2024: arriving birds are regular this month but not last; leaving birds are regular this month but not next.
Other months
All 207 birds in April
207 birds
WoodpigeonColumba palumbusResidentCommon40–42 cmRecorded all year · 2.78% in Apr
ChiffchaffPhylloscopus collybitaSummer visitorCommon10–12 cmRegularly Mar–Nov · 2.63% in Apr
Hooded CrowCorvus cornixResidentCommon44–51 cmRecorded all year · 2.57% in Apr
BlackbirdTurdus merulaResidentCommon24–25 cmRecorded all year · 2.49% in Apr
Great TitParus majorResidentCommonRecorded all year · 2.43% in Apr
MallardAnas platyrhynchosResidentCommon50–65 cmRecorded all year · 2.26% in Apr
Greylag GooseAnser anserResidentCommon75–90 cmRecorded all year · 2.23% in Apr
Blue TitCyanistes caeruleusResidentCommon11–12 cmRecorded all year · 2.06% in Apr
ChaffinchFringilla coelebsResidentCommon14–16 cmRecorded all year · 2.01% in Apr
Pied WagtailMotacilla albaSummer visitorCommon17–19 cmRegularly Mar–Oct · 1.98% in Apr
European Herring GullLarus argentatusResidentCommon55–67 cmRecorded all year · 1.83% in Apr
Eurasian WrenTroglodytes troglodytesResidentCommon9–10 cmRecorded all year · 1.82% in Apr
Black-headed GullChroicocephalus ridibundusResidentCommon38–44 cmRecorded all year · 1.82% in Apr
Mute SwanCygnus olorResidentCommon140–160 cmRecorded all year · 1.70% in Apr
Great CormorantPhalacrocorax carboResidentCommon80–100 cmRecorded all year · 1.65% in Apr
Eurasian SkylarkAlauda arvensisResidentCommon16–18 cmRecorded all year · 1.53% in Apr
MagpiePica picaResidentCommon44–46 cmRecorded all year · 1.47% in Apr
CootFulica atraResidentCommon36–42 cmRecorded all year · 1.46% in Apr
European RobinErithacus rubeculaResidentCommon13–14 cmRecorded all year · 1.46% in Apr
JackdawColoeus monedulaResidentCommon34–39 cmRecorded all year · 1.40% in Apr
Grey HeronArdea cinereaResidentCommon90–98 cmRecorded all year · 1.38% in Apr
Common GullLarus canusResidentCommon40–46 cmRecorded all year · 1.36% in Apr
Common StarlingSturnus vulgarisResidentCommon21–23 cmRecorded all year · 1.33% in Apr
GreenfinchChloris chlorisResidentCommon15–16 cmRecorded all year · 1.19% in Apr
BuzzardButeo buteoResidentCommon51–57 cmRecorded all year · 1.16% in Apr
Northern LapwingVanellus vanellusResidentCommon28–31 cmRecorded all year · 1.12% in Apr
Song ThrushTurdus philomelosSummer visitorCommon20–23 cmRegularly Mar–Dec · 1.12% in Apr
RookCorvus frugilegusResidentCommon45–47 cmRecorded all year · 1.12% in Apr
Tufted DuckAythya fuligulaResidentCommon40–47 cmRecorded all year · 1.11% in Apr
Common ShelduckTadorna tadornaResidentCommon58–67 cmRecorded all year · 1.08% in Apr
DunnockPrunella modularisSummer visitorCommon14–15 cmRecorded all year · 1.03% in Apr
Meadow PipitAnthus pratensisSummer visitorCommon14–15 cmRecorded all year · 1.02% in Apr
Eurasian OystercatcherHaematopus ostralegusResidentCommon40–45 cmRecorded all year · 1.00% in Apr
LinnetLinaria cannabinaSummer visitorCommon13–14 cmRegularly Mar–Nov · 1.00% in Apr
Reed BuntingEmberiza schoeniclusSummer visitorCommon14–16 cmRecorded all year · 0.98% in Apr
YellowhammerEmberiza citrinellaResidentCommon16–17 cmRecorded all year · 0.94% in Apr
Eurasian TealAnas creccaResidentCommon34–38 cmRecorded all year · 0.93% in Apr
Common PheasantPhasianus colchicusResidentCommon50–90 cmRecorded all year · 0.93% in Apr
Great Spotted WoodpeckerDendrocopos majorResidentCommon23–26 cmRecorded all year · 0.91% in Apr
KestrelFalco tinnunculusResidentCommon32–39 cmRecorded all year · 0.87% in Apr
Western Marsh-harrierCircus aeruginosusSummer visitorCommon48–56 cmRegularly Mar–Nov · 0.87% in Apr
BlackcapSylvia atricapillaSummer visitorCommon13–15 cmRegularly Apr–Nov · 0.86% in Apr
SparrowhawkAccipiter nisusResidentCommon28–38 cmRecorded all year · 0.85% in Apr
Barn SwallowHirundo rusticaSummer visitorCommon17–19 cmRegularly Apr–Oct · 0.83% in Apr
European GoldfinchCarduelis carduelisResidentCommon12–13 cmRecorded all year · 0.82% in Apr
Willow WarblerPhylloscopus trochilusSummer visitorCommon11–13 cmRegularly Apr–Sep · 0.81% in Apr
Great Black-backed GullLarus marinusResidentCommon64–79 cmRecorded all year · 0.79% in Apr
Eurasian WigeonMareca penelopeWinter visitorCommon42–51 cmRecorded all year · 0.74% in Apr
Eurasian Tree SparrowPasser montanusResidentCommon13–14 cmRecorded all year · 0.71% in Apr
Eurasian NuthatchSitta europaeaWinter visitorCommon12–15 cmRecorded all year · 0.68% in Apr
Great Crested GrebePodiceps cristatusResidentCommon46–51 cmRecorded all year · 0.68% in Apr
House SparrowPasser domesticusResidentCommon14–17 cmRecorded all year · 0.67% in Apr
Barnacle GooseBranta leucopsisWinter visitorCommon58–70 cmRecorded all year · 0.65% in Apr
EiderSomateria mollissimaResidentCommon50–71 cmRecorded all year · 0.65% in Apr
BullfinchPyrrhula pyrrhulaResidentCommon15–17 cmRecorded all year · 0.64% in Apr
GadwallMareca streperaResidentCommon46–56 cmRecorded all year · 0.63% in Apr
RedshankTringa totanusResidentCommon27–29 cmRecorded all year · 0.62% in Apr
Eurasian JayGarrulus glandariusResidentCommon32–35 cmRecorded all year · 0.61% in Apr
White-tailed Sea-eagleHaliaeetus albicillaResidentCommon66–94 cmRecorded all year · 0.60% in Apr
Red-breasted MerganserMergus serratorResidentCommon52–58 cmRecorded all year · 0.58% in Apr
Red-necked GrebePodiceps grisegenaResidentCommon40–50 cmRecorded all year · 0.57% in Apr
Northern ShovelerSpatula clypeataResidentCommon44–51 cmRecorded all year · 0.56% in Apr
Common RavenCorvus coraxResidentCommon54–67 cmRecorded all year · 0.54% in Apr
Red KiteMilvus milvusResidentCommon60–66 cmRecorded all year · 0.53% in Apr
MoorhenGallinula chloropusResidentCommon30–38 cmRecorded all year · 0.53% in Apr
Eurasian SiskinSpinus spinusWinter visitorCommon11–13 cmRecorded all year · 0.50% in Apr
GoldcrestRegulus regulusWinter visitorCommon9–10 cmRecorded all year · 0.49% in Apr
Common CraneGrus grusSummer visitorCommon100–130 cmRecorded all year · 0.48% in Apr
GoldeneyeBucephala clangulaWinter visitorCommon40–51 cmRecorded all year · 0.43% in Apr
Lesser WhitethroatCurruca currucaSummer visitorCommon11–13 cmRegularly Apr–Sep · 0.42% in Apr
Common RedstartPhoenicurus phoenicurusSummer visitorCommon13–15 cmRegularly Apr–Sep · 0.41% in Apr
Ringed PloverCharadrius hiaticulaSummer visitorCommon17–19 cmRegularly Feb–Oct · 0.41% in Apr
CurlewNumenius arquataResidentCommon50–60 cmRecorded all year · 0.40% in Apr
PochardAythya ferinaResidentCommon42–49 cmRecorded all year · 0.38% in Apr
BramblingFringilla montifringillaWinter visitorCommon14–16 cmRegularly Sep–May · 0.38% in Apr
Marsh TitPoecile palustrisWinter visitorCommon12–13 cmRecorded all year · 0.37% in Apr
FieldfareTurdus pilarisWinter visitorCommon22–27 cmRegularly Sep–Jun · 0.37% in Apr
Lesser Black-backed GullLarus fuscusSummer visitorCommon52–64 cmRegularly Mar–Nov · 0.37% in Apr
Sandwich TernThalasseus sandvicensisSummer visitorCommon36–41 cmRegularly Mar–Oct · 0.37% in Apr
AvocetRecurvirostra avosettaSummer visitorUncommon42–45 cmRegularly Mar–Nov · 0.35% in Apr
RedwingTurdus iliacusWinter visitorCommon20–24 cmRegularly Oct–Apr · 0.35% in Apr
Little GrebeTachybaptus ruficollisResidentCommon23–29 cmRecorded all year · 0.34% in Apr
Coal TitPeriparus aterResidentUncommon10–12 cmRecorded all year · 0.34% in Apr
Hen HarrierCircus cyaneusWinter visitorCommon41–52 cmRegularly Aug–May · 0.34% in Apr
Common ScoterMelanitta nigraResidentCommon43–54 cmRecorded all year · 0.32% in Apr
Mistle ThrushTurdus viscivorusWinter visitorUncommon26–29 cmRecorded all year · 0.32% in Apr
Eurasian Collared DoveStreptopelia decaoctoResidentUncommon30–32 cmRecorded all year · 0.31% in Apr
Common RedpollAcanthis flammeaResidentUncommon12–14 cmRecorded all year · 0.31% in Apr
Carrion CrowCorvus coroneResidentUncommon45–47 cmRecorded all year · 0.30% in Apr
Long-tailed TitAegithalos caudatusWinter visitorCommon13–16 cmRecorded all year · 0.30% in Apr
Tree PipitAnthus trivialisSummer visitorCommon14–16 cmRegularly Apr–Oct · 0.29% in Apr
OspreyPandion haliaetusSummer visitorUncommon54–58 cmRegularly Mar–Oct · 0.28% in Apr
Common SnipeGallinago gallinagoSummer visitorCommon25–27 cmRecorded all year · 0.27% in Apr
TreecreeperCerthia familiarisResidentUncommon12–14 cmRecorded all year · 0.27% in Apr
Water RailRallus aquaticusResidentUncommon23–28 cmRecorded all year · 0.27% in Apr
Northern PintailAnas acutaWinter visitorCommon59–76 cmRegularly Jul–May · 0.26% in Apr
Golden PloverPluvialis apricariaWinter visitorCommon26–29 cmRegularly Jul–May · 0.25% in Apr
Common MerganserMergus merganserWinter visitorCommon58–68 cmRecorded all year · 0.24% in Apr
Rock DoveColumba liviaResidentCommon31–34 cmRecorded all year · 0.24% in Apr
Green SandpiperTringa ochropusSummer visitorCommon21–24 cmRegularly Mar–Sep · 0.24% in Apr
RuffCalidris pugnaxSummer visitorUncommon20–32 cmRegularly Mar–Oct · 0.24% in Apr
Ring OuzelTurdus torquatusPassage migrantUncommon23–24 cmRegularly Apr–Oct · 0.23% in Apr
Stock DoveColumba oenasSummer visitorUncommon32–34 cmRecorded all year · 0.23% in Apr
WheatearOenanthe oenantheSummer visitorCommon15–16 cmRegularly Apr–Oct · 0.23% in Apr
StonechatSaxicola rubicolaSummer visitorUncommon12–13 cmRecorded all year · 0.23% in Apr
GreenshankTringa nebulariaSummer visitorCommon30–35 cmRegularly Apr–Oct · 0.23% in Apr
Eurasian BitternBotaurus stellarisSummer visitorUncommon69–81 cmRegularly Nov–Aug · 0.22% in Apr
Northern GannetMorus bassanusResidentUncommon87–100 cmRecorded all year · 0.22% in Apr
GarganeySpatula querquedulaSummer visitorUncommon37–41 cmRegularly Mar–Sep · 0.21% in Apr
BluethroatLuscinia svecicaSummer visitorUncommon13–14 cmRegularly Mar–Aug · 0.19% in Apr
House MartinDelichon urbicumSummer visitorCommon13–15 cmRegularly Apr–Sep · 0.19% in Apr
Rough-legged HawkButeo lagopusWinter visitorUncommon46–59 cmRegularly Sep–May · 0.18% in Apr
Yellow WagtailMotacilla flavaSummer visitorCommon15–17 cmRegularly Apr–Sep · 0.18% in Apr
Sand MartinRiparia ripariaSummer visitorCommon12–14 cmRegularly Apr–Sep · 0.18% in Apr
Red-throated LoonGavia stellataResidentUncommon53–69 cmRecorded all year · 0.18% in Apr
Great White EgretArdea albaWinter visitorCommon80–104 cmRecorded all year · 0.18% in Apr
Black RedstartPhoenicurus ochrurosSummer visitorUncommon13–15 cmRecorded all year · 0.18% in Apr
HawfinchCoccothraustes coccothraustesResidentUncommon17–18 cmRecorded all year · 0.17% in Apr
DunlinCalidris alpinaSummer visitorCommon16–22 cmRecorded all year · 0.17% in Apr
Short-toed TreecreeperCerthia brachydactylaResidentUncommon12–14 cmRecorded all year · 0.16% in Apr
Brent GooseBranta berniclaWinter visitorCommon55–66 cmRegularly Sep–Jun · 0.16% in Apr
FirecrestRegulus ignicapillaSummer visitorUncommon9–10 cmRecorded all year · 0.16% in Apr
RazorbillAlca tordaResidentUncommon38–43 cmRecorded all year · 0.16% in Apr
Common TernSterna hirundoSummer visitorCommon31–35 cmRegularly Apr–Oct · 0.14% in Apr
Bearded TitPanurus biarmicusResidentUncommon13–15 cmRecorded all year · 0.14% in Apr
Little Ringed PloverThinornis dubiusSummer visitorUncommon14–17 cmRegularly Mar–Sep · 0.14% in Apr
Velvet ScoterMelanitta fuscaResidentUncommon51–58 cmRecorded all year · 0.14% in Apr
Peregrine FalconFalco peregrinusWinter visitorUncommon34–58 cmRecorded all year · 0.14% in Apr
MerlinFalco columbariusWinter visitorUncommon24–33 cmRegularly Aug–Jun · 0.14% in Apr
Corn BuntingEmberiza calandraResidentUncommon16–19 cmRecorded all year · 0.12% in Apr
Long-tailed DuckClangula hyemalisWinter visitorUncommon37–60 cmRegularly Oct–May · 0.12% in Apr
Red CrossbillLoxia curvirostraResidentUncommon15–17 cmRecorded all year · 0.12% in Apr
Black-tailed GodwitLimosa limosaSummer visitorUncommon40–44 cmRegularly Mar–Nov · 0.11% in Apr
Crested TitLophophanes cristatusResidentUncommon11–12 cmRecorded all year · 0.11% in Apr
Canada GooseBranta canadensisResidentUncommon76–110 cmRecorded all year · 0.10% in Apr
Whooper SwanCygnus cygnusWinter visitorCommon140–165 cmRegularly Oct–Apr · 0.10% in Apr
WoodlarkLullula arboreaSummer visitorUncommon15–17 cmRegularly Feb–Nov · 0.10% in Apr
Arctic LoonGavia arcticaResidentUncommon58–77 cmRecorded all year · 0.09% in Apr
SanderlingCalidris albaResidentUncommon18–20 cmRecorded all year · 0.09% in Apr
WhimbrelNumenius phaeopusSummer visitorUncommon40–46 cmRegularly Apr–Sep · 0.09% in Apr
Arctic JaegerStercorarius parasiticusSummer visitorUncommon41–46 cmRegularly Apr–Oct · 0.09% in Apr
Common SandpiperActitis hypoleucosPassage migrantCommon18–20 cmRegularly Apr–Sep · 0.09% in Apr
European Green WoodpeckerPicus viridisResidentUncommon30–36 cmRecorded all year · 0.09% in Apr
Sedge WarblerAcrocephalus schoenobaenusSummer visitorUncommon12–13 cmRegularly Apr–Sep · 0.08% in Apr
Tawny OwlStrix alucoResidentUncommon37–43 cmRecorded all year · 0.08% in Apr
Bar-tailed GodwitLimosa lapponicaSummer visitorUncommon37–41 cmRecorded all year · 0.08% in Apr
Greater White-fronted GooseAnser albifronsWinter visitorCommon64–81 cmRegularly Oct–Apr · 0.08% in Apr
Arctic TernSterna paradisaeaSummer visitorUncommon33–39 cmRegularly Apr–Oct · 0.07% in Apr
Black GuillemotCepphus grylleResidentUncommon30–32 cmRecorded all year · 0.07% in Apr
Greater ScaupAythya marilaWinter visitorUncommon39–56 cmRegularly Jul–May · 0.07% in Apr
Grey PartridgePerdix perdixResidentUncommon28–32 cmRecorded all year · 0.07% in Apr
KittiwakeRissa tridactylaResidentUncommon37–41 cmRecorded all year · 0.07% in Apr
Wood SandpiperTringa glareolaSummer visitorCommon19–21 cmRegularly Apr–Sep · 0.07% in Apr
European Pied FlycatcherFicedula hypoleucaPassage migrantUncommon12–14 cmRegularly Apr–Oct · 0.06% in Apr
Northern GoshawkAstur gentilisResidentUncommon46–61 cmRecorded all year · 0.06% in Apr
Black-necked GrebePodiceps nigricollisSummer visitorUncommon28–34 cmRegularly Mar–Sep · 0.06% in Apr
Grey WagtailMotacilla cinereaWinter visitorUncommon17–20 cmRecorded all year · 0.06% in Apr
Horned GrebePodiceps auritusWinter visitorUncommon31–38 cmRegularly Sep–May · 0.06% in Apr
Short-eared OwlAsio flammeusResidentUncommon34–43 cmRegularly Sep–Jul · 0.06% in Apr
Common KingfisherAlcedo atthisWinter visitorUncommon16–17 cmRecorded all year · 0.06% in Apr
WhinchatSaxicola rubetraSummer visitorUncommon12–14 cmRegularly Apr–Sep · 0.05% in Apr
Eurasian SpoonbillPlatalea leucorodiaSummer visitorUncommon80–90 cmRegularly Mar–Oct · 0.05% in Apr
Little TernSternula albifronsSummer visitorUncommon21–25 cmRegularly Apr–Aug · 0.05% in Apr
Great Grey ShrikeLanius excubitorWinter visitorUncommon22–26 cmRegularly Oct–Apr · 0.05% in Apr
Mediterranean GullIchthyaetus melanocephalusSummer visitorRare37–40 cmRegularly Jan–Oct · 0.05% in Apr
Spotted RedshankTringa erythropusSummer visitorUncommon29–31 cmRegularly Apr–Nov · 0.05% in Apr
Pink-footed GooseAnser brachyrhynchusWinter visitorUncommon60–75 cmRegularly Sep–May · 0.05% in Apr
SmewMergellus albellusWinter visitorCommon38–44 cmRegularly Nov–Apr · 0.05% in Apr
HobbyFalco subbuteoSummer visitorUncommon28–35 cmRegularly Apr–Sep · 0.04% in Apr
TwiteLinaria flavirostrisWinter visitorUncommon13–14 cmRegularly Oct–Apr · 0.04% in Apr
Golden EagleAquila chrysaetosResidentRare66–102 cmRegularly Sep–Jul · 0.04% in Apr
Bohemian WaxwingBombycilla garrulusWinter visitorUncommon19–23 cmRegularly Oct–Apr · 0.04% in Apr
Wood WarblerPhylloscopus sibilatrixSummer visitorUncommon11–13 cmRegularly Apr–Sep · 0.04% in Apr
Grey PloverPluvialis squatarolaSummer visitorUncommon27–30 cmRegularly Apr–Feb · 0.03% in Apr
WryneckJynx torquillaSummer visitorUncommon16–18 cmRegularly Apr–Sep · 0.03% in Apr
Little GullHydrocoloeus minutusSummer visitorUncommon25–30 cmRecorded all year · 0.03% in Apr
SerinSerinus serinusSummer visitorRare11–12 cmRegularly Apr–Oct · 0.03% in Apr
Eurasian WoodcockScolopax rusticolaWinter visitorUncommon33–38 cmRegularly Oct–Jul · 0.03% in Apr
Red KnotCalidris canutusSummer visitorUncommon23–26 cmRegularly Apr–Jan · 0.03% in Apr
Rock PipitAnthus petrosusWinter visitorUncommon16–18 cmRegularly Sep–Apr · 0.03% in Apr
Ruddy TurnstoneArenaria interpresResidentUncommon21–24 cmRecorded all year · 0.03% in Apr
Red-crested PochardNetta rufinaSummer visitorUncommon53–57 cmRegularly Jan–Jul · 0.02% in Apr
Egyptian GooseAlopochen aegyptiacaResidentRare63–73 cmRegularly Dec–Sep · 0.02% in Apr
Lesser Spotted WoodpeckerDryobates minorPassage migrantUncommon14–16 cmRegularly Dec–Sep · 0.02% in Apr
Horned LarkEremophila alpestrisPassage migrantUncommon16–20 cmRegularly Oct–Apr · 0.02% in Apr
Jack SnipeLymnocryptes minimusPassage migrantUncommon17–19 cmRegularly Sep–Apr · 0.02% in Apr
Kentish PloverCharadrius alexandrinusSummer visitorUncommon15–17 cmRegularly Apr–Aug · 0.02% in Apr
Glaucous GullLarus hyperboreusPassage migrantRare62–68 cmRegularly Feb–May · 0.02% in Apr
FulmarFulmarus glacialisSummer visitorUncommon45–50 cmRegularly Feb–Nov · 0.02% in Apr
Red-breasted GooseBranta ruficollisPassage migrantRare53–56 cmRegularly Apr · 0.02% in Apr
Grasshopper WarblerLocustella naeviaSummer visitorUncommon12–13 cmRegularly Apr–Sep · 0.01% in Apr
Long-eared OwlAsio otusWinter visitorUncommon35–40 cmRegularly Oct–Aug · 0.01% in Apr
Willow TitPoecile montanusWinter visitorRare11–12 cmRegularly Dec–Oct · 0.01% in Apr
European Turtle-doveStreptopelia turturPassage migrantRare26–28 cmRegularly Apr–May · 0.01% in Apr
Purple SandpiperCalidris maritimaWinter visitorUncommon20–22 cmRegularly Sep–Apr · 0.01% in Apr
HoopoeUpupa epopsPassage migrantRare25–32 cmRegularly Mar–Apr · 0.01% in Apr
Montagu's HarrierCircus pygargusSummer visitorUncommon43–47 cmRegularly Apr–Aug · 0.01% in Apr
Black TernChlidonias nigerSummer visitorUncommon22–26 cmRegularly Apr–Sep · 0.01% in Apr
Boreal OwlAegolius funereusPassage migrantRare21–28 cmRegularly Mar–Apr · 0.01% in Apr
Common LoonGavia immerPassage migrantRare66–91 cmRegularly Oct–May · 0.01% in Apr
Spotted CrakePorzana porzanaPassage migrantRare19–23 cmRegularly Apr–Jun · 0.01% in Apr
Parrot CrossbillLoxia pytyopsittacusWinter visitorUncommon16–18 cmRegularly Oct–Apr · 0.01% in Apr
DotterelEudromias morinellusPassage migrantRare20–22 cmRegularly Apr–May · 0.01% in Apr
Iceland GullLarus glaucoidesPassage migrantRare52–60 cmRegularly Jan–Apr · 0.01% in Apr
Lapland LongspurCalcarius lapponicusPassage migrantRare15–16 cmRegularly Sep–Apr · 0.00% in Apr
Savi's WarblerLocustella luscinioidesSummer visitorRare13–14 cmRegularly Apr–Jul · 0.00% in Apr
Little EgretEgretta garzettaSummer visitorRare55–65 cmRegularly Mar–Jul · 0.00% in Apr
Data: EOD – eBird Observation Dataset (Cornell Lab of Ornithology), accessed via GBIF.org, CC BY 4.0. Records from 2019–2024, aggregated and filtered by Birdfact. How these lists are made