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don't some baby birds make fecal sacs?
grouse and pheasants leave their nest as soon as the babies dry off
after hatching, before they ever eat anything, and usually never return
to the nest. So these babies don't need to worry about their nest getting
dirty! Baby raptors, herons, and some seabirds that nest on cliffs just
back up to the edge of the nest or cliff to poop in a projectile squirt--this
isn't as good a way of keeping the nest clean, but it works well enough.
fecal sacs, what other things do parent birds carry away from nests?
shells after the babies hatch
that don't hatch
that die in the nest
things that appear in the nest (Sometimes if a bander puts bands
on the legs of nestlings, the parents will try to carry off the
shiny, unfamiliar bands--with the babies still attached! So banders
have to keep an eye on banded nestlings to protect them until the
parents get used to the bands on their babies.)