Apparatus which comprises a plurality of containers (2) for holding animals (1, 4), wherein the conditions in each container are isolated from the conditions in other containers. The apparatus is provided with a measurement device (3, 10) for taking a measurement related to a first container or an animal associated with the first container. An actuator (5, 11) is also provided to perform an action on the first container, its environment or on an animal associated with the first container. The apparatus is particularly useful for providing an improved animal population and rearing process. It is particularly useful for rearing insects.
