1

2

3

Archaeopteryx

Arboreal

Insect-Net

Climbing

Cursorial Theory

Arboreal

Insect-Net

Climbing

Insect-net

Arboreal

Insect-Net

Climbing

4

Aerodynamic Surfaces

Angle

of attack

5

Bernoulli’s principle

As fluid velocity increases,

pressure in the fluid decreases.

Bernoulli’s principle

+

_

Fast

Slow

Bernoulli’s principle

Vortices Aerodynamic Adaptations

6

Sclerotic ring

Separation

Feathers

Contour feathers

Innominate

Synsacrum

“Tubular”

7

Recall: Cheetah vs. Horse

Soaring vs. Hovering

Soaring vs. Hovering Feathers

Secondaries

(lift)

Primaries

(thrust)

8

Prairie FalconPeregrine Falcon—stoop

Red-tailed hawk Burrowing owl

9

Barn owl Barn owl