Research suggests many animals copulate from time to time, without the delivery of semen, which has baffled scientists, as animal sex is thought to be solely driven by the need to reproduce. New studies, however, suggest males may be engaging in "casual" sex to encourage fidelity. Tommaso Pizzari at the University of Oxford and his team studied feral chickens, known for their promiscuity.

Scientists have discovered a track from a three-toed dinosaur said to be about 70 million years old, in the Denali national Park, in Alaska. According to an Associated Press report, a University of Alaska Fairbanks student first discovered the footprint on June 27, while taking a geology field course.

The Associated Press reports the return of a monkey, on its own accord, after its escape from the San Diego Zoo Friday. Takala, a golden-bellied mangabey, got out of the new monkey exhibit but he was found less than an hour later, waiting to get back inside.

Marlene Kess, who has a reputation as a cat lover, running a "no-kill" animal shelter in Manhattan, was charged with health code violations after 200 dead cats were discovered in her backyard, rotting away in garbage bags. According to Sgt. Joseph Bierman of the state's Society for the Prevention of Cruelty to Animals, it appeared the dead cats were going to be buried in a large hole that had been dug.

After receiving worldwide attention, two Bengal tiger cubs who were breast-fed by a Yangon housewife have died of heat and dehydration. Hla Htay, a mother of a baby boy, answered a plea for help from Yangon's zoo and fed the cats three times a day after they were rejected by their tigress mother.