Long Evans

Long Evans Rat


The Long Evans rat is a descendant of Wistar female rats crossed with a gray male rat of unknown origins (believed to be wild) by Dr. Long and Dr. Evans in 1915. The Wistar can be traced back to Dr. Donaldson who established a colony at the Wistar Institute. Hilltop rederived the line by cesarean section. Colony histories contain some possibility of error. This information is provided to the best of Hilltop's knowledge.
Viral Antibody Profile
Services Offered
  • Retired Breeders
  • Timed Pregant
  • Untimed Pregnant
  • Littermates
  • Mothers with Litters


The coat color of the rat is white with a black/brown hood. The eyes are pigmented. The rat colony is maintained as an outbred colony. The colony at Hilltop Lab Animals, Inc. is a closed colony. Closed colonies develop qualities causing the rats to be uniquely suited to certain types of research.