Porphyrin is a red secretion from the eyes or nose of a rat. It can also be present in the rats’ urine. People often mistake porphyrin...

BEHAVIORAL & ENVIRONMENTAL ENRICHMENT Rats are intelligent and will soon get bored with the same food, toys and routine. When planning...

THE ENRICHED INVIRONMENT: “…Donald Hebb (1949) kept some rats at home as pets… Back in the laboratory, these privileged rats were far...