Clemson University student Nathan Weaver set out to determine how to help turtles cross the road. He ended up getting a glimpse into the dark souls of some humans.

Weaver put a realistic rubber turtle in the middle of a lane on a busy road near campus. Then he got out of the way and watched over the next hour as seven drivers swerved and deliberately ran over the animal. Several more apparently tried to hit it but missed.

"I've heard of people and from friends who knew people that ran over turtles. But to see it out here like this was a bit shocking," said Weaver, a 22-year-old senior in Clemson's School of Agricultural, Forest and Environmental Sciences.

To seasoned researchers, the practice wasn't surprising.

The number of box turtles is in slow decline, and one big reason is that many wind up as roadkill while crossing the asphalt, a slow-and-steady trip that can take several minutes.

Like a pair of Velcro stripper pants, gecko tails come off easy. The lizards have pre-formed score lines in their tail that allow them to quickly rip off their tails when a predator has grabbed it, according to a new study.

The gecko tails, which were described Wednesday in the journal PLoS One, essentially stick to the body of the animals with adhesive forces.

"The tail contains 'score lines' at distinct horizontal fracture planes where the tail may be released as a response to predation," the authors wrote in the article. "These scores penetrate all the way through the tissue where the structural integrity is maintained by adhesion forces."

Australian officials shut down a day-care center in the Northern Territory Thursday because of an infestation of at least 23 baby pythons and their much larger mother.

It all started Wednesday, when a single hatchling Australian carpet python was spotted at the Mitchell Street Childcare Center in Darwin. The following day, seven more little snakes were seen slithering around the community center, which cares for children 6 weeks to five years old.

Director Louise DeBomford called the city of Darwin and two contractors were sent to investigate the issue. They peeked inside the center’s walls and discovered something shocking.

“They found the nest and mum,” DeBomford said.

Their 10-foot-long mom, to be specific. The wall contained a total of 41 broken eggshells, suggesting there were still nearly 20 foot-long serpents unaccounted for.

Inside were seven baby eastern brown snakes, considered to be the world’s second most venomous species.

"I was pretty shocked, particularly because I don't like snakes," she said.

Fortunately the lid of the container was on tight and the snakes weren’t yet mature enough to push it off.

Kyle and his mum took the snakes to Billabong Sanctuary where wildlife careers released them back into the wild.

Researchers saw it happen many times and were perplexed: If all of a pond's amphibians were wiped out, and a few frogs or salamanders came back and recolonized the pond, they would also die—even though there were no amphibians in the pond to harbor the disease.

One possible reason is that chytrid infects other animals. For a study published today in Proceedings of the National Academy of Sciences, Taegan McMahon, a graduate student in ecology at the University of South Florida in Tampa, looked at some possible suspects and focused on crayfish, those lobsterlike crustaceans living in freshwater.

[...]

The fungus seems to be able to dine on crayfish then leap back to amphibians when it gets a chance. No one knows for sure where the fungus originally came from or why it's been such a problem in recent decades, but this research suggests one way that it could have been spread. Crayfish are sometimes moved from pond to pond as fish bait and are sold around the world as food and aquarium pets.

An old Russian way of keeping milk from going sour by putting a frog in the bucket of milk has led to the finding of new antibiotic substances, scientists say.

Organic chemist A.T. Lebedev of Moscow State University and colleagues have identified a number of potential new antibiotic compounds in the skin of the Russian Brown frog, a study published in the American Chemical Society's Journal of Proteome Research reported.

[...]

In lab tests, they said, some of the substances performed as well against salmonella and staphylococcus bacteria as some prescription antibiotic medicines.

"These peptides could be potentially useful for the prevention of both pathogenic and antibiotic resistant bacterial strains while their action may also explain the traditional experience of rural populations," the researchers wrote.

Siegel and his Towson colleagues found that an alarming number of turtles -- which can live to be 50 or older and normally have a 98 percent survival rate from year to year -- were dying at the relocation area near the construction site. Thirty-one of the 123 turtles outfitted with the transmitters and released there were found dead within a three-year period. Cars or construction equipment killed three of the turtles, but the rest were felled by disease, which turned out to be ranavirus in 27 cases.

"Finding even one dead turtle is unusual," Siegel said in a Washington Post story about the die-off that appeared earlier this year. "Finding over 27 dead turtles in a two-to-three-year period was bizarre."

In addition to killing the Maryland box turtles, ranavirus is believed to have been the cause of death of nearly every tadpole and young salamander in the study area since spring of 2010.

Mesosaurs, and even their earlier ancestors, possibly "were not able to produce hard-shelled eggs, at least for the first several million years of their evolution," lead author Graciela Piñeiro, a paleontologist at Uruguay's Facultad de Ciencias, told Discovery News. "After the recent discovery of mesosaur embryos, we can state with a high degree of confidence that embryo retention developed early in amniote evolution, given that mesosaurs are among the basal-most reptiles and that they date from the Early Permian around 280 million years ago."

Piñeiro and colleagues Jorge Ferigolo, Melitta Meneghel and Michel Laurin recently discovered the exceptionally well-preserved mesosaur embryos at sites in Uruguay and Brazil. The environmental conditions at the locations allowed for the preservation of soft tissues, nerves and blood vessels, she said.