CONE SNAIL The tropical sluggard kills by overdosing fish with a toxic cloud containing insulin, researchers report this week in the Proceedings of the National Academy of Sciences. Plummeting blood sugar levels throw the victims into a stupor. Cone snails are notorious for stinging scuba divers tempted to pick up their beautiful shells. But the geographic cone snail (Conus geographus)—the most venomous cone snail of all, with several human deaths under its belt—takes its practice of poisoning to a whole new level. It looks like the fish is completely narced, says Christopher Meyer, a cone snail specialist at the Smithsonians National Museum of Natural History, who wasnt involved in the study. Once the fish are in a sugar coma, the cone snail reaches out with whats called a false mouth—it looks like its throwing a cape over its prey—and drags a stupefied animal into its mouth. The snail then stings the fish with another set of toxins, just to make sure its victim is completely paralyzed. This sped-up video shows a cone snail engulfing a stunned fish. Other compounds in cone snail venom produce similar results, says Helen Safavi-Hemami, who studies the toxins at the University of Utah in Salt Lake City. Victims become dazed and confused, leading researchers to call this group of toxins, including the insulin, the nirvana cabal. But no other animal that researchers know of—except perhaps people—uses insulin to kill like this, lead study author Safavi-Hemami says. A sensational case in the early 1980s involved a husband accused of trying to kill his very rich wife using insulin injections. How brilliant is this, says Meyer, who has observed a close cousin of the geographic cone snail—named Conus tulipa—hunting and killing fish in the same way in Guam. The fish almost look like theyre passed out drunk, he says, and now we know why. Video- youtube/watch?v=zcBmMPJrrKk
Posted on: Tue, 27 Jan 2015 00:16:41 +0000
Trending Topics
Recently Viewed Topics
© 2015