cozy arctic redpoll (acanthis hornemanni) nest

acanthis arctic birch bird birder birding birds birdwatcher breeding clutch color cozy cup dust ecology education egg egglaying eggs eyrie feathers five forest guide hatching hollow hornemanni laying learning lichen mottled nature nest nesting nests ornithology partridge redpoll scale six small smear soft song speckled spotty student tiny tree wagtail watching white wildlife wood