How many Tyrannosaurus rexes roamed North America during the Cretaceous period?

The rapid extinction of giant animals including wombat-like creatures as big as cars, birds more than two meters tall, and lizards more than seven meters long that once roamed the Australian continent is a puzzle that has long engaged researchers.

A trio of researchers from the University of Pisa has found that lions, like many other animals, engage in contagious yawning. In their paper published in the journal Animal Behavior, Grazia Casetta, Andrea Paolo Nolfo and Elisabetta Palagi describe their study of lions living in the wild in Africa and what they learned about their yawning practices.

Researchers at Tel Aviv University were able to reconstruct the nutrition of stone age humans. In a paper published in the Yearbook of the American Physical Anthropology Association, Dr. Miki Ben-Dor and Prof. Ran Barkai of the Jacob M. Alkov Department of Archaeology at Tel Aviv University, together with Raphael Sirtoli of Portugal, show that humans were an apex predator for about two million years. Only the extinction of larger animals (megafauna) in various parts of the world, and the […]

After more than three decades of research, scientists have proven that the cancer affecting up to one in four adult California sea lions necrospied at The Marine Mammal Center in Sausalito, CA, is caused by a sexually transmitted herpesvirus. The cancer, known as sea lion urogenital carcinoma, has clear parallels to cervical cancer in humans and provides a helpful model for human cancer study.