Species Profile
Red Crossbill
Loxia curvirostra
Quick Facts
Conservation
LCLeast ConcernAlso known as: Common Crossbill
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Appearance
The Red Crossbill is a small finch with a distinctive crossed bill. Adult males are primarily brick-red with darker wings and tails, while females are olive-green with yellowish rumps.
Both sexes have strong, crossed mandibles adapted for extracting seeds from conifer cones.
Juveniles resemble females but are more heavily streaked. The intensity of red in males can vary, and some populations show slight differences in bill size and shape based on their preferred conifer species.
Identification & Characteristics
Male Colors
- Primary
- Red
- Secondary
- Brown
- Beak
- Grey
- Legs
- Brown
Female Colors
- Primary
- Green
- Secondary
- Grey
- Beak
- Grey
- Legs
- Brown
Male Markings
Crossed beak, males are reddish, females are greenish
Tail: Forked tail, black in color
Female Markings
Olive-green body with yellowish rump
Tail: Forked tail, black in color
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Red Crossbills inhabit coniferous and mixed forests across North America, Europe, and Asia. They are found in boreal forests, montane regions, and temperate woodlands, where their preferred conifer species grow.
In North America, they are present year-round in parts of Canada, the western United States, and the northeastern U.S. Their distribution can vary widely between years, depending on cone crop availability.
Distribution
Diet
Red Crossbills primarily feed on seeds from various conifer species, including pines, spruces, and firs. Their specialized bills allow them to efficiently extract seeds from closed cones.
They occasionally supplement their diet with insects, especially when feeding young, and may visit feeders for sunflower seeds in winter.
Behaviour
Red Crossbills are highly nomadic, moving in flocks in search of abundant conifer seed crops. They exhibit remarkable dexterity when feeding, using their crossed bills to pry open cone scales and extract seeds.
These birds often hang upside down on cones while feeding, demonstrating their acrobatic abilities.
Calls & Sounds
Red Crossbills are known for their variety of calls. The most common is a sharp, metallic 'kip-kip-kip' often given in flight. They also produce a softer, warbling song during courtship and breeding.
Different populations or 'call types' have distinct vocalizations, which may play a role in their complex taxonomy.
Nesting & Breeding
Red Crossbills have a flexible breeding season, often nesting when conifer seed crops are abundant, even in winter. Pairs form strong bonds, often staying together for multiple breeding seasons.
Nests are typically built high in conifer trees, constructed of twigs, grass, and moss, and lined with softer materials. Females lay 3-4 pale blue-green eggs with dark markings.
Incubation lasts about 12-16 days, and it is primarily done by the female while the male provides food. Nestlings fledge after 15-20 days but continue to be fed by their parents for several weeks after leaving the nest.
Conservation
While the Red Crossbill is currently listed as Least Concern, it faces challenges from habitat loss due to deforestation and climate change. These factors can affect the availability of conifer seeds, their primary food source.
Conservation efforts focus on preserving mature coniferous forests and monitoring population trends.
Population
Estimated: 91,000,000 - 173,000,000 mature individuals[2]
Trend: Stable[3]
Overall population stable with local fluctuations
Elevation
Sea level to 4,100 meters
Additional Details
- Egg size:
- Approximately 2cm x 1.5cm
- Predators:
- Main predators include hawks, owls, and squirrels, which target both adults and nestlings.
- Alarm calls:
- Sharp, short chirps
- Breeding age:
- 1
- Maturity age:
- 1
- Feeding times:
- Throughout the day, peaking at dawn and dusk
- Major threats:
- Habitat loss due to deforestation
- Parental care:
- Both parents feed chicks, with females solely incubating
- Primary calls:
- Jip-jip-jip sound
- Social habits:
- Gregarious, often forming large flocks
- Egg appearance:
- Pale blue with dark speckles
- Feeding habits:
- Extracts seeds from cones using its crossed bill
- Breeding season:
- Dependent on food availability, but most commonly January to March
- Diet variations:
- None known
- Fledging period:
- Approximately 18-22 days
- Average lifespan:
- 4
- Call description:
- Series of high pitch calls, often in flight
- Daily activities:
- Mostly active during the day, foraging for food in the morning and late afternoon
- Nesting location:
- Coniferous trees
- Number of broods:
- 1-3 broods, with sometimes even 4
- Incubation period:
- Around 12-14 days
- Nest construction:
- Shallow cup of twigs, lined with grass and feathers
- Migration patterns:
- Irruptive, dependent on food availability
- Migratory patterns:
- Irruptive, dependent on food availability
- Age related changes:
- None known
- Prey capture method:
- Forages in trees
- Conservation efforts:
- Protected in several regions, habitat preservation efforts
- Territorial behavior:
- Nomadic, no fixed territory
- Reproductive behavior:
- Monogamous, breeds in loose colonies
- Special dietary needs:
- None known
- Clutch characteristics:
- 3-4 eggs
- Interaction with other species:
- Can be aggressive towards other bird species in feeding areas
Birdwatching Tips
- Listen for their distinctive 'kip-kip' call as they fly overhead
- Look for them in coniferous forests, especially during cone-rich years
- Observe their unique sideways feeding motion on cones
- Check for them at bird feeders during winter in some regions
Did You Know?
- Red Crossbills can breed at any time of year, even in winter, if conifer seeds are abundant.
- There are at least ten recognized 'call types' of Red Crossbills, each specialized for different conifer species.
- Their crossed bills grow continuously, compensating for wear from constant use.
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