WEBVTT 00:01.900 --> 00:03.000 align:left position:10% line:89% size:80% JOAN CARTAN-HANSEN, HOST: 00:03.000 --> 00:04.166 align:left position:10% line:89% size:80% Snakes have long scaly bodies 00:04.166 --> 00:05.500 align:left position:10% line:89% size:80% with no arms and legs, and they 00:05.500 --> 00:06.866 align:left position:10% line:89% size:80% live almost everywhere on Earth. 00:06.866 --> 00:08.333 align:left position:10% line:89% size:80% Snakes play an important role in 00:08.333 --> 00:09.600 align:left position:10% line:89% size:80% our ecosystem. 00:09.600 --> 00:10.900 align:left position:10% line:89% size:80% So let's find out more about 00:10.900 --> 00:12.033 align:left position:10% line:89% size:80% these amazing reptiles. 00:12.266 --> 00:17.066 align:left position:10% line:89% size:80% (MUSIC) 00:19.900 --> 00:22.233 align:left position:10% line:89% size:80% THERE ARE OVER 2500 DIFFERENT 00:22.233 --> 00:24.333 align:left position:10% line:89% size:80% TYPES OF SNAKES IN THE WORLD. 00:24.333 --> 00:25.933 align:left position:10% line:89% size:80% SNAKES ARE REPTILES. 00:25.933 --> 00:27.700 align:left position:10% line:89% size:80% THEY'RE COLDBLOODED; THAT MEANS 00:27.700 --> 00:28.933 align:left position:10% line:89% size:80% A SNAKE'S BODY TEMPERATURE 00:28.933 --> 00:30.466 align:left position:10% line:89% size:80% DEPENDS UPON THE TEMPERATURE OF 00:30.466 --> 00:32.066 align:left position:10% line:89% size:80% WHERE IT LIVES. 00:32.066 --> 00:33.700 align:left position:10% line:89% size:80% SO SNAKES LIKE TO KEEP WARM BY 00:33.700 --> 00:35.700 align:left position:10% line:89% size:80% ABSORBING HEAT FROM SUNSOAKED 00:35.700 --> 00:37.533 align:left position:10% line:89% size:80% ROCKS OR FROM THE GROUND. 00:37.533 --> 00:39.333 align:left position:10% line:89% size:80% OR THEY HIDE UNDER ROCK PILES OR 00:39.333 --> 00:43.100 align:left position:10% line:89% size:80% LOWLYING PLANTS TO STAY COOL. 00:43.100 --> 00:44.100 align:left position:10% line:89% size:80% STUDENT: SNAKES HAVE SCALES 00:44.100 --> 00:46.400 align:left position:10% line:89% size:80% COVERING THEIR SKIN. 00:46.400 --> 00:48.166 align:left position:10% line:89% size:80% THE SCALES PROTECT THEIR BODIES 00:48.166 --> 00:49.966 align:left position:10% line:89% size:80% LIKE ARMOR. 00:49.966 --> 00:51.566 align:left position:10% line:89% size:80% THE SCALES ALSO HELP KEEP 00:51.566 --> 00:53.233 align:left position:10% line:89% size:80% MOISTURE INSIDE THEIR BODIES SO 00:53.233 --> 00:56.333 align:left position:10% line:89% size:80% THEY DON'T DRY OUT IN THE SUN. 00:56.333 --> 00:57.600 align:left position:10% line:89% size:80% CARTAN-HANSEN: SNAKES TRAVEL IN 00:57.600 --> 00:59.000 align:left position:10% line:89% size:80% DIFFERENT WAYS. 00:59.000 --> 01:00.700 align:left position:10% line:89% size:80% MOST COMMONLY A SNAKE MOVES BY 01:00.700 --> 01:02.533 align:left position:10% line:89% size:80% PUSHING ONE SIDE OF ITS BODY AND 01:02.533 --> 01:04.400 align:left position:10% line:89% size:80% THEN THE OTHER AGAINST ROCKS OR 01:04.400 --> 01:06.133 align:left position:10% line:89% size:80% BUMPS ON THE GROUND. 01:06.133 --> 01:07.533 align:left position:10% line:89% size:80% IT CAN ALSO USE ITS SCALES TO 01:07.533 --> 01:09.966 align:left position:10% line:89% size:80% HELP GET SOME TRACTION. 01:09.966 --> 01:11.500 align:left position:10% line:89% size:80% SNAKES DON'T HAVE EYELIDS. 01:11.500 --> 01:13.300 align:left position:10% line:89% size:80% INSTEAD, SNAKES HAVE A CLEAR 01:13.300 --> 01:15.033 align:left position:10% line:89% size:80% SCALE PROTECTING THEIR EYES, 01:15.033 --> 01:16.733 align:left position:10% line:89% size:80% THAT'S WHY THEY ALWAYS LOOK LIKE 01:16.733 --> 01:18.200 align:left position:10% line:89% size:80% THEY'RE STARING. 01:18.200 --> 01:19.800 align:left position:10% line:89% size:80% SNAKES DON'T HAVE EARS, LIKE WE 01:19.800 --> 01:21.233 align:left position:10% line:89% size:80% DO, BUT ARE VERY GOOD AT 01:21.233 --> 01:23.100 align:left position:10% line:89% size:80% DETECTING VIBRATIONS. 01:23.100 --> 01:25.000 align:left position:10% line:89% size:80% AND SNAKES HAVE SPECIAL SMELL 01:25.000 --> 01:26.900 align:left position:10% line:89% size:80% DETECTORS IN THEIR MOUTH AND CAN 01:26.900 --> 01:28.500 align:left position:10% line:89% size:80% PICK UP THE SCENTS IN THE AIR 01:28.500 --> 01:30.866 align:left position:10% line:89% size:80% WITH THEIR FORKED TONGUE. 01:30.866 --> 01:32.366 align:left position:10% line:89% size:80% STUDENT: SNAKES ARE PREDATORS. 01:32.366 --> 01:34.000 align:left position:10% line:89% size:80% THEY EAT THEIR FOOD WHOLE. 01:34.000 --> 01:35.400 align:left position:10% line:89% size:80% THEY HAVE SPECIAL JAWS THAT 01:35.400 --> 01:36.833 align:left position:10% line:89% size:80% ALLOW THEM TO OPEN THEIR MOUTHS 01:36.833 --> 01:39.166 align:left position:10% line:89% size:80% REALLY WIDE. 01:39.166 --> 01:40.566 align:left position:10% line:89% size:80% CARTAN-HANSEN: SNAKES USUALLY 01:40.566 --> 01:41.966 align:left position:10% line:89% size:80% LIE IN WAIT AND THEN QUICKLY 01:41.966 --> 01:43.366 align:left position:10% line:89% size:80% STRIKE AND GRAB THEIR PREY. 01:43.366 --> 01:45.166 align:left position:10% line:89% size:80% SOME SNAKES, LIKE BOAS, SQUEEZE 01:45.166 --> 01:46.833 align:left position:10% line:89% size:80% THEIR PREY TO DEATH, AND SOME 01:46.833 --> 01:48.866 align:left position:10% line:89% size:80% SNAKES INJECT VENOM TO KILL 01:48.866 --> 01:50.233 align:left position:10% line:89% size:80% THEIR PREY. 01:50.233 --> 01:51.633 align:left position:10% line:89% size:80% RATTLESNAKES ARE THE BEST KNOWN 01:51.633 --> 01:53.166 align:left position:10% line:89% size:80% OF THE VENOMOUS SNAKES HERE IN 01:53.166 --> 01:54.533 align:left position:10% line:89% size:80% THE AMERICAS. 01:54.533 --> 01:55.800 align:left position:10% line:89% size:80% WHEN A RATTLESNAKE SENSES 01:55.800 --> 01:57.333 align:left position:10% line:89% size:80% DANGER, THEY MAKE A LOUD NOISE 01:57.333 --> 01:58.700 align:left position:10% line:89% size:80% WITH THEIR RATTLES AT THE END OF 01:58.700 --> 02:00.566 align:left position:10% line:89% size:80% THEIR TAILS. 02:00.566 --> 02:03.366 align:left position:10% line:89% size:80% IT'S A WARNING TO STAY AWAY. 02:03.366 --> 02:05.066 align:left position:10% line:89% size:80% THOUGH MOST SNAKES ARE HARMLESS, 02:05.066 --> 02:06.400 align:left position:10% line:89% size:80% YOU NEVER KNOW, SO DON'T BOTHER 02:06.400 --> 02:09.400 align:left position:10% line:89% size:80% SNAKES IN THE WILD. 02:09.400 --> 02:10.733 align:left position:10% line:89% size:80% STUDENT: BUT SNAKES YOU BUY AT 02:10.733 --> 02:11.800 align:left position:10% line:89% size:80% THE PET STORE CAN MAKE GOOD 02:11.800 --> 02:13.366 align:left position:10% line:89% size:80% PETS. 02:13.366 --> 02:14.700 align:left position:10% line:89% size:80% JOAN CARTAN-HANSEN: JUST BE SURE 02:14.700 --> 02:16.333 align:left position:10% line:89% size:80% YOU KNOW HOW TO CARE FOR THEM 02:16.333 --> 02:17.800 align:left position:10% line:89% size:80% PROPERLY AND THAT YOU WANT TO DO 02:17.800 --> 02:19.233 align:left position:10% line:89% size:80% IT FOR A LONG TIME BECAUSE SOME 02:19.233 --> 02:20.733 align:left position:10% line:89% size:80% SNAKES CAN LIVE AS LONG AS 20 02:20.733 --> 02:22.666 align:left position:10% line:89% size:80% YEARS. 02:22.666 --> 02:23.966 align:left position:10% line:89% size:80% MANY PEOPLE ARE AFRAID OF 02:23.966 --> 02:25.200 align:left position:10% line:89% size:80% SNAKES. 02:25.200 --> 02:26.300 align:left position:10% line:89% size:80% DON'T BE. 02:26.300 --> 02:27.666 align:left position:10% line:89% size:80% SNAKES PLAY AN IMPORTANT ROLE IN 02:27.666 --> 02:29.033 align:left position:10% line:89% size:80% NATURE. 02:29.033 --> 02:30.300 align:left position:10% line:89% size:80% THEY EAT A LOT OF THINGS WE 02:30.300 --> 02:31.666 align:left position:10% line:89% size:80% THINK OF AS PESTS. 02:31.666 --> 02:33.066 align:left position:10% line:89% size:80% SO WITHOUT THEM, WE WOULD BE IN 02:33.066 --> 02:34.266 align:left position:10% line:89% size:80% TROUBLE. 02:34.266 --> 02:35.633 align:left position:10% line:89% size:80% SNAKES LIVE IN ALMOST EVERY PART 02:35.633 --> 02:37.000 align:left position:10% line:89% size:80% OF THE WORLD. 02:37.000 --> 02:38.400 align:left position:10% line:89% size:80% A FEW TYPES OF SNAKES ARE 02:38.400 --> 02:39.800 align:left position:10% line:89% size:80% ENDANGERED BECAUSE WE'RE 02:39.800 --> 02:41.000 align:left position:10% line:89% size:80% DESTROYING THEIR HABITAT OR 02:41.000 --> 02:42.366 align:left position:10% line:89% size:80% KILLING THEM OFF. 02:42.366 --> 02:43.700 align:left position:10% line:89% size:80% SO RESPECT SNAKES. 02:43.700 --> 02:44.933 align:left position:10% line:89% size:80% DON'T BOTHER THEM IN THE WILD. 02:44.933 --> 02:46.800 align:left position:10% line:89% size:80% AND APPRECIATE THEIR ROLE IN THE 02:46.800 --> 02:49.300 align:left position:10% line:89% size:80% BALANCE OF NATURE. 02:49.300 --> 02:50.500 align:left position:10% line:89% size:80% If you want to learn more about 02:50.500 --> 02:51.700 align:left position:10% line:89% size:80% snakes, check out the Science 02:51.700 --> 02:53.033 align:left position:10% line:89% size:80% Trek website, you'll find it at 02:53.033 --> 03:14.633 align:left position:10% line:89% size:80% ScienceTrek.org. 03:14.633 --> 03:15.800 align:left position:10% line:89% size:80% ANNOUNCER: Presentation of 03:15.800 --> 03:17.200 align:left position:10% line:89% size:80% Science Trek on Idaho Public 03:17.200 --> 03:18.633 align:left position:10% line:89% size:80% Television is made possible 03:18.633 --> 03:20.200 align:left position:10% line:89% size:80% through the generous support of 03:20.200 --> 03:21.433 align:left position:10% line:89% size:80% the Laura Moore Cunningham 03:21.433 --> 03:22.866 align:left position:10% line:89% size:80% Foundation, committed to 03:22.866 --> 03:24.266 align:left position:10% line:89% size:80% fulfilling the Moore and Bettis 03:24.266 --> 03:25.966 align:left position:10% line:89% size:80% family legacy of building the 03:25.966 --> 03:28.300 align:left position:10% line:89% size:80% great state of Idaho. 03:28.300 --> 03:29.500 align:left position:10% line:89% size:80% By the Idaho National 03:29.500 --> 03:31.766 align:left position:10% line:89% size:80% Laboratory, mentoring talent and 03:31.766 --> 03:34.333 align:left position:10% line:89% size:80% finding solutions for energy and 03:34.333 --> 03:36.300 align:left position:10% line:89% size:80% security challenges, by The 03:36.300 --> 03:37.766 align:left position:10% line:89% size:80% Friends of Idaho Public 03:37.766 --> 03:39.066 align:left position:10% line:89% size:80% Television and by the 03:39.066 --> 03:40.433 align:left position:10% line:89% size:80% Corporation for Public 03:40.433 --> 03:42.200 align:left position:10% line:89% size:80% Broadcasting.