crossbill
Twisted-beak seed-eater
A crossbill is a finch with a distinctive beak whose upper and lower parts curve past each other, crossing at the tips.
This unusual structure lets the bird pry open conifer cones to extract seeds.
Several species exist across northern forests: A flock of red crossbills descended on the spruce trees.
Of northern regions
- taigaSubarctic evergreen biome
- coniferousProducing woody cones
- forestTree-dense ecosystem
- spruceNeat; also a conifer
fir · pine · evergreen · woodland · arboreal · northern · montane · Scandinavian
Tapered solid, circular base
- seedEmbryonic plant capsule
- pineconeWoody seed-bearing structure
- extractionAct of removing
- foragingSeeking wild food sources
prying · kernel · husk · spruce · fir · pine · larch · hemlock
Fitting to new conditions
- specializationConcentrated expertise in one field
- coevolutionReciprocal adaptation between interacting species
- nicheRecessed wall space
- divergenceSeparation from common origin
speciation · morphology · irruption · nomadic · ecological · natural selection
Lower facial bone
- curvedSmoothly bent, not angular
- hookedDeeply dependent or bent
- maxillaUpper jaw bone
- keratinStructural hair protein
crisscross · interlocking · specialized · tweezers · pliers · gripping · prying · overlapping
boreal
Of northern regions
- taigaSubarctic evergreen biome
- coniferousProducing woody cones
- forestTree-dense ecosystem
spruce · fir · pine · evergreen · woodland · arboreal · northern · montane · Scandinavian · Siberian
cone
Tapered solid, circular base
- seedEmbryonic plant capsule
- pineconeWoody seed-bearing structure
- extractionAct of removing
foraging · prying · kernel · husk · spruce · fir · pine · larch · hemlock · conifer
adaptation
Fitting to new conditions
- specializationConcentrated expertise in one field
- coevolutionReciprocal adaptation between interacting species
- nicheRecessed wall space
divergence · speciation · morphology · irruption · nomadic · ecological · natural selection
mandible
Lower facial bone
keratin · crisscross · interlocking · specialized · tweezers · pliers · gripping · prying · overlapping · asymmetrical
finch
Small seed-eating songbird
- British Wildlifered deer, badgers, grey squirrel, foxes, otter
- European wildlifegrey wolf, red squirrel, brown hare, wild cat, mouflon
- Forest Birdswoodpecker, nuthatch, chickadee, titmouse, treecreeper
- seed eatersfinch, finches, goldfinch, sparrows, canary
- songbirdsrobin, sparrow, canary, bluebird, cardinal
- bird beaksbeak, mandible, hooked beak, eagle beak, spoonbill