Flying Creatures Chapter 4

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muscles that help a bird flap its wings

flight muscles

bone in chest which is attached to flight muscles

keel

bone on wing which is attached to flight muscles

humerus

when flight muscles pull the wings up

upstroke

when flight muscles pull the wings down

downstroke

a bird's path that has an up and down pattern

undulating flight

heat pockets in the air

thermals

seasonal movement of an animal

migrate

to sleep through winter

hibernate

the length of a day

photoperiod

chemicals that regulate behavior

hormones

ability of a bird to reach a destination without getting lost

homing instinct

large structures that do not move which are used for navigation

landmarks

patterns of stars in the sky

constellations

magnetic substance found in the heads of birds

magnetite

birds that fly off the normal migration pattern

vagrants

an instrument sailors once used for navigation

sextant