hare: swift timid long-eared mammal larger than a rabbit having a divided upper lip and long hind legs; young born furred and with open eyes
vertebrate: animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
integral calculus: the part of calculus that deals with integration and its application in the solution of differential equations and in determining areas or volumes etc.