Predators of the pelagic thresher include larger fishes (including other sharks) and toothed whales. The bigeye thresher has a virtually circumtropical distribution. The three extant thresher shark species are all in the genus "Alopias". The large eyes of the bigeye thresher are adapted for hunting in low light conditions. She was the U.S. Navy's second submarine to be named after the thresher shark. Thresher sharks are solitary creatures which keep to themselves. No distinct breeding season is observed by thresher sharks. The eyes of the bigeye thresher can measure up to across in adults. Little information is available on the feeding ecology of the pelagic thresher. The United States lost two nuclear submarines during this time&colon; USS "Thresher" and "Scorpion". Over and over, the thresher and hovers, the wheatfield"". The only machine here is the Japanese rice thresher. All torpedoes expended, "Thresher" headed for Midway. He built his first thresher/separator in 1852. The Samahan imported and operated the first rice thresher in the country.