PROJECT WRITING : Imagine yourself as a snake and write about it
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The earliest known fossils are from the Jurassic period. This was between 143 and 167 million years ago.[4]
Their long, slender body has some special features.[5] They have overlapping scales which protect them, and help them move and climb trees. The scales have colours which may be camouflage or warning colours.
Many species have skulls with more joints than the skulls of their lizard ancestors. This allows the snakes to swallow prey much larger than their heads. In their narrow bodies, snakes' paired organs (such as kidneys) appear one in front of the other instead of side by side. Most have only one working lung. Some species have kept a pelvic girdle with a pair of vestigial claws on either side of the cloaca. They have no eyelids or external ears. They can hiss, but otherwise make no vocal sounds.
They are very mobile in their own way. Most of them live in the tropics. Few snake species live beyond the Tropic of Cancer or Tropic of Capricorn, and only one species, the common viper (Vipera berus) lives beyond the Arctic Circle.[5] They can see well enough, and they can taste scents with their tongues by flicking them in and out. They are very sensitive to vibrations in the ground. Some snakes can sense warm-blooded animals by thermal infrared.
Most snakes live on the ground, and in the trees. Others live in the water, and a few live under the soil. Like other reptiles, snakes are ectotherms. They control their body temperature by moving in and out of the direct sunshine. That is why they are rare in cold places.[6]
Snakes range in size from the tiny, 10.4 cm (4 inch)-long thread snake[7] to the reticulated python of 6.95 meters (22.8 ft) in length.[8] The extinct snake Titanoboa was 12.8 meters (42 ft) long.
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