Zoocenosis [Greek zoon – animal, living being, koinos – communal] – a part of biocenosis, total number of animals characterized by particular composition and set interrelations between themselves and environment.

Zoochores – see Allochores.

Zoocides [Greek zoon – animal and Latin caedere – to kill] – chemical agents for fighting against animals (rats – rodenticides, birds – avicides, etc.). See Pesticides.

Zooplankton – The animal forms of plankton. They consume phytoplankton or other zooplankton. See also phytoplankton.