Animals of different sizes work differently. Small ones have squeaky voices, their hearts beat faster, and they breathe more often than larger ones. On the other hand, the skeleton of a larger animal is more robustly built than that of a small animal. The ratio of the diameter to the length is greater in a larger animal than it is in a smaller one. Thus there are regular distortions in the proportions of animals as the size increases from small to large.

Identify a problem worth studying and list the variables that affect the behavior you have identified. Which variables would be neglected completely? Which might be considered as constants initially? Can you identify any sub models you would want to study in detail? Identify any data you would want collected.