To estimate the weight of a gray whale, figure one ton per foot in length. Keep baby animals in something that is 90 to 95 degrees F until their eyes are open, then lower the temperature 5 degrees a week to room temperature. A grown rat can pass through a whole the size of a quarter. Some breeds of sheep look like goats and some breads of goats look like sheep. In general, sheep's tail hand down and goats tails stand up.
Bears can outrun, out climb and out swim a human.
Your only hope is to run downhill. A bear's center of gravity makes it difficult for them to run downhill. A snake needs a cage whose perimeter is equal to or greater then it's body length. Pets Pets are like vacations - they cost at least twice as much as you think they will. The majority of the above rules of thumb were taken directly from Never Trust A Calm Dog and Other Rules of Thumb by Tom Parker.