| A | B |
|---|
| flight muscles | The two major muscles making up the breast of the bird; used for flight |
| Humerous | The wing bone of a bird. |
| keel | Breast bone to which flight muscles are attached. |
| downstroke | When the large pectoralis muscle pulls the wind downward in flight. |
| upstroke | When the small supracoracoideus flight muscle to lift the wing in flight. |
| thermals | Warmed air from the ground that causes updrafts of air. |
| undulating flight | The up and down motion of a bird's flight pattern as opposedf to the stightline flight of other birds. |
| migrate | The relocation of animals due to seasonal pressures. |
| hibernate | When animals sleep through the winter. |
| photoperiod | The length of the daylight hours; varies with the season. |
| hormones | Chemicals that cause changes in an animal or plant. |
| homing instinct | Ability for a bird to reach its destination without getting lost. |
| Landmarks | Large structures that don't change |
| Constellations | Patterns of stars. |
| Magnetite | Magnetic mineral composed of Fe3O4 |
