Lower-Row Caging in a Two-Tiered Housing System does not affect the Behaviour of Young, Singly Housed Rhesus Macaques

It has been suggested that housing of laboratory primates in two-tiered racks adversely affects the psychological well-being of those primates housed on the lower row. Excessive darkness and its consequences are among the factors suggested to account for the supposed diminished well-being of lower-row inhabitants. Additionally, two-tiered housing has been suggested to introduce unacceptable variation […]