Bills/Eggs
made of this substance
keratin
downhill
gliding
a ridge on the sternum
keel
bathing without using water
dusting
use these muscles to raise wings
pectoralis minor
gaping
remaining stationary in the air
hovering
how birds produce sound without vocal cords
syrinx
use ants to clean their plumage
anting
retractable group of feathers supported by a bird's "thumb" bone
alula
use their bills to spread oil, that comes from this gland, over their feathers
preen gland
fastest flying birds
peregrine falcon
used to grind food and make it easily absorbed
gizzard
group of smaller birds harass larger birds
mobbing
knowledge birds are born with
instinct
calcium carbonate
colors and markings that help identify the bird species
field marks
wing bone which major flying muscles connect
humerus
don't provide any parental care for their young
megapodes
type of vision that allows birds to see different areas of the world around them
monocular
the region of the egg where the embryo develops
germinal spot
feathers extending from a bird's "hand" to the tip of its wing
primary flight
strong feathers found on the bird's body, wings, and tail
contour
loose this patch of feathers so they can incubate an egg
brood patch
food storage sac in a bird's esophagus
crop