fetus: an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal
vertebrate: animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
paper chase: an outdoor game; one group of players (the hares) start off on a long run scattering bits of paper (the scent) and pursuers (the hounds) try to catch them before they reach a designated spot