flightlessness - Flightless Locomotion Flightlessness Has...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Has evolved many times (not a quirk) Can evolve very quickly (thousands of years) In all cases, the predecessors can fly We can sometimes see the process in action http://www.youtube.com/watch?v=wQiDOfD8Vv8 Kokako (New Zealand)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Flightlessness When does it happen? Most common on islands Often no predators (example: New Zealand) There has to be more than lack of predators, though Flight is energetically expensive (in two ways) To do To maintain the ability to do (pectoralis = 17% of body mass) Flightless birds can be very large (why?)
Background image of page 2
Swimming Penguins Water is dense, so drag (not lift) is the main problem Drag ~ (length) 2 Wing Area ~ (length) 2 Flippers are relatively small -- proportional to body size Body size can be large
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Penguins “fly” through water (power up-stroke Muscles for up-stroke are on back Better leverage More rounded profile
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 08/24/2011.

Page1 / 13

flightlessness - Flightless Locomotion Flightlessness Has...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online