They floated down from the sky Sunday — 2,000 mice, wafting on tiny cardboard parachutes over Andersen Air Force Base in the U.S. territory of Guam.

But the rodent commandos didn't know they were on a mission: to help eradicate the brown tree snake, an invasive species that has caused millions of dollars in wildlife and commercial losses since it arrived a few decades ago.

That's because they were dead. And pumped full of painkillers.

The unlikely invasion was the fourth and biggest rodent air assault so far, part of an $8 million U.S. program approved in February to eradicate the snakes and save the exotic native birds that are their snack food.

Ruchira Somaweera, a zoologist at the University of Sydney and principal investigator in the yearlong field study, which is funded by the National Geographic Society, said the data is still being analyzed, but the primary hypothesis is that the horns are used in communication within specific species.

Somaweera and his team focused mainly on the critically endangered leaf-nosed lizards (C. tennentii) and found that on these and on rhino horn lizards (C. stoddartii), the males of both species can move their horns slowly at a 45-degree angle while opening their mouths in a threat display.

This may aid in communication between males, he said.

(Election strategist Dr.) Ong (Kian Ming) claimed that there was an obvious question of corruption within Perhilitan (Department of Wildlife and National Parks) as public records show that Wong and his wife, Cheah Bing Shee still owned companies involving in importing and exporting wildlife.

He said there was a need to see if there was anyone who was helping them obtain the permits, despite the Government's insistence that all of Wong and Cheah's licenses had been revoked.

"This affects Malaysia's reputation. Anson Wong could just be the tip of the iceberg. If Malaysia is identified as a possible transshipment hub for illegal wildlife activities, this will give us a bad reputation, " he warned.

Donald Schultz, 35, the former host of "Wild Recon" on Animal Planet, pleaded guilty Tuesday in federal court to violating the Endangered Species Act by offering to sell, and actually selling, two live desert monitor lizards (Varanus griseus) in interstate commerce, according to the U.S. District Attorney's Office.

Schultz admitted that on July 29, 2010, he sold the lizards to an undercover agent with the U.S. Fish and Wildlife Service, who was posing as a prospective buyer, and shipped the lizards from Los Angeles to Buffalo, New York.

Schultz told NBC4 that he kept the lizards as pets, but decided to sell them because he was moving.

"Someone contacted me and asked to buy them from me," said Schultz. "In retrospect, it was a stupid thing to do. I had no idea it was against the law."