Section 17.3-- Family Life of Birds Flashcards
annually moving to different regions that is characteristic of many kinds of birds
migration
it is common for birds to gather in large groups called
flocks
migration champion of the world
arctic tern
some things known about migration:
- migrating bords follow the same rout every year (flyway)
- a keen sense of direction and a recognition of landmarks is involved
- the position of the sun and stars guides many birds
- the earth’s magnetic fields helps guide some birds
- timing appears to be influenced by birds’ pituitary gland and by environmental factors such as weather and length of daylight
- generally occurs in the spring and fall
- most migration is north and south
finding a mate is usually associated with
territoriality
recognition of the proper species
courtship is ordinarily dominated by the
male
the egg expands in route to the cloaca as ___________ is added to it, having been manufactured and secreted by special glands
albumen (egg white)
the center part of the egg
yolk
accounts for the entire center part (yolk)
egg cell
the bulk of the yolk body is a fat rich food source for the tiny embryo, which develops at a special location called the
germinal spot
a very dense twisted cord that runs through the middle of the albumen layers
is attached to the yolk and acts as a support for the yolk
chalaza
an unlearned knowledge that an animals possesses from birth
instinct
all the activity of picking a nesting spot, making the nest, making sure it’s padded correctly is for a specific purpose:
protecting the eggs
the purpose of birds’ varied nests is one:
providing for a place for the birds to incubate the eggs
involves keeping the eggs warm, usually by an adult sitting on them
incubation
in response to the presence of eggs, the adult loses feathers on its belly to expose a patch of skin called the
brood patch
most American songbird hatchlings are ____________
means that they are naked and helpless at hatching
altricial
chicks of most water birds are____________
means that they are covered with down and able to run or swim almost immediately after hatching
precocial
all doves and pigeons produce _________________ rich in protein and fat
produced by special cells lining the crop instead of by external glands
crop milk
two major effects of territorial behavior is
isolation
dispersion
