| A | B |
|---|
| Weight divided by wing area | wing loading |
| distance between wing tips | wingspan |
| wingspan divided by average wing width | aspect ratio |
| spread of seeds over a wide area | dispersal |
| flying with motionless wings | soaring |
| motion as nost of plane turns left or right | yaw |
| motion as nos tof plane points up or down | pitch |
| tilting motion as one wing dips lower than the other | roll |
| movable flap on a plane's vertical tail fin | rudder |
| movable flap on a plane's horizontal tail surface | elevator |
| Birds change pitch by... | moving wings forward and back or flexing tail feathers |
| birds change yaw by... | by raising wings higher above bodies |
| birds change roll by... | flexing primary wing feathers or tails |
| birds land by... | spreadingtheir feathers to increase wing area |
| bird increase speed by... | by holding wings closer to their body, thus reducing wing area and wingspan |
| List three structual features that are the same for birds and airplanes | wings, streamlined, shape, rigid skelton |
| what feature provides lift in both birds and airplanes? | wings |
| what feature allows air to flow around the bird or airplane with less drag? | streamlined shape |
| what characteristics of wing affect left? | wing area, shape, and angel |
