birds
flat appendages growing from a bird's skin and forming its plumage
definition of feather
the muscular part of a bird's stomach
gizzard
hooved
ungulate
the fat of sea mammals
blubber
the process of carrying in the womb between conception and birth
gestation
breastbone of a bird
keel
a form of communication
courtship
the first stomach of a ruminant
rumen
fluid stored in the bladder
urine
the action of inhaling
inhalation
an extension of a bird's lung cavity
air sac
white of a birds egg
albumen
plumping the egg
uterus
a dome-shaped muscular partition separating the thorax from the abdomen in mammals
diaphragm
breathe out
exaltation
voice box
syrinx
to keep warm until hatch
incubate
can be used as an extra limb
prehensile tail
the hollow muscular organ forming an air passage to the lungs and holding the vocal cords
larynx
individual structures growing out of the shaft that collectively make up the vanes of the feathers
barb
muscular pouch located on the front of a bird's neck
crop
seasonal movement of animals from one region to another
migration
a vascular fetal membrane
placenta
the milk-producing gland
mammary gland
the tube leading down from the pharynx to the crop
esophagus