A cage for the behavioural study of living organisms, in particular for a toximeter, includes at least one compartment intended to hold a living organism, the cage being transparent at least on an observation side in order to allow the observation of the living beings from an observation point located at a distance from the observation side, the compartment being delimited by separators, characterized in that the wall of one separator is inclined with respect to the wall of another separator such that the walls of the separators of a compartment are closer together in the direction of the observation side, said separators being aligned along convergence lines that meet at the observation point.
