Watch the following video tutorial on the characteristics of animals that indicate their size and scale.http://youtu.be/unPNLMBWolI
[PDF of Slides]
Have a question? Go here.
Optional: Learn more about animals and scale from these interesting articles:
"On Being the Right Size," by J. B. S. Haldane
"The Biology of B-Movie Monsters" by Michael C. LaBarbera.