What are some shared characters among rabbits and perch?

The only "perch" I found that is an animal is a fish. The perch is the common name of the fish that is under the genus Perca. They are freshwater gamefish.

There are 3 species of perch are:
1)  European perch (Perca fluviatilis) - found in Europe and Asia.
2)  Balkhash perch (Perca schrenkii) - found in Kazakhstan, Uzbekistan, and China. 
3)  yellow perch (Perca flavescens) - found in the United States and Canada.

The shared characteristics among rabbits and perch are:
1) general body type of long and round.
2) vary in sizes based on their breeds (rabbit) and species(perch)

The answer is constant.