• snake
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○○○ eyelid ⪢⪢
Their fierce stare may seem threatening but don't take it personally: snakes can't blink because they don't have eyelids.
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○○○ fang ⪢⪢
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Pillow English Listening

○○○ infrared receptor ⪢⪢
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○○○ microscopic ⪢⪢
You will often see snakes flicking their tongue in and out. Again this snake is not being rude. It is actually tasting the air - collecting microscopic particles which it can analyze using a special organ in the roof of its mouth.
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○○○ nostril ⪢⪢
Although snakes do have ordinary nostrils with which to smell, more sensitive investigations require their tongue.
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○○○ reptile ⪢⪢
Snakes are reptiles which means that they breathe air, have scaly skin, and are cold-blooded. Cold-blooded animals cannot maintain their own body temperature.
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○○○ scaly ⪢⪢
Scaly and slithery, long and legless, snakes are easy to recognize. ￫ scale
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○○○ squeeze ⪢⪢
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○○○ venomous ⪢⪢
￫ venom
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○○○ vertebrate ⪢⪢
Snakes are also vertebrates which means that they have a backbone. Actually snakes are almost ALL backbone! A snake's skeleton is most made of its skull, the vertebrate (or bones of the spine) and ribs.
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