Most birds can’t smell, but kiwis can [check out “Kiwis” for more info].
The left side of the human brain controls speech. The left side of the bird’s brain controls song.
A professional whistler says 95 percent of songbirds sing in the key of E flat.
It’s not unusual for a bird’s eye to weigh more than its brain.
Nothing man-made has a higher warmth-to-weight ratio than the down of birds, or so they say.
Some birds lay pear-shaped eggs...especially cliff-nesting birds. Their eggs roll in circles, so not off the cliffs.
Some birds do indeed sing for pure pleasure.
All birds have three lids over each eye.
The American Kestrel is the smallest North American hawk and feeds mainly on mice and insects.