In this Oct. 25, 2014 photo, courtesy of Rebecca Ross, Darwin the Labrador retriever sniffs at a snail in while being trained in Texas. Darwin traveled in December from Texas to the the Galapagos island Santa Cruz. Darwin is one of two dogs selected to hunt the mollusk on the island, which is the largest species of snail found on land and can grow to 20 centimeters (7.8 inches) long. (Rebecca Ross/Dogs for Conservation via AP) (The Associated Press)
QUITO, Ecuador – When Darwin the Labrador retriever crashed out of a service dog program for people, conservationists found him a very different sort of job: sniffing out giant African land snails that are threatening crops on the most visited of Ecuador's Galapagos Islands.