Despite the huge number of dinosaur fossils found, from bones to feathers, precious little exists in the fossil record to explain dinosaur defecation, urination, or copulation. Thankfully, all three ...

Jan. 19 (UPI) --For the first time, scientists have described the cloaca, or vent, of a dinosaur -- the all-purpose opening used for reproduction and waste disposal. Many mammals have distinct ...

Cloacal prolapse or vent prolapse is a condition where the inner tissues of the cloaca protrude (hang out) from the vent, exposing the intestines, cloaca or uterus. The cloaca is the part of the ...

Zoologically speaking, the cloaca is the undifferentiated posterior orifice in birds, reptiles, and amphibians. It serves urinary, digestive, and reproductive functions carried out by specialized ...

The Australian Egg Corporation has expressed surprise at the discovery of a gecko inside a chicken egg. Darwin doctor Peter Beaumont was cooking dinner when he cracked open the egg and found the dead ...

How did digits evolve? While it is clear that they derive from genetic programs already present in fish, their precise origin remains a matter of debate. An international team led by the University of ...

This cloaca is more than 100 million years old, and it did a lot of work for this extinct species. By Katherine J. Wu The world’s oldest known all-purpose orifice sits in a fossil display case in the ...