Dolphins January 31, 2008
Posted by spiri in sea.trackback
1. Dolphins, which have about 80 species, are mammals living in the sea and rivers.
2. A grown dolphin comes out at sea level every about 15 minutes, and she/he breathes air from a hole at the top.
3. Their brains are like human’s brains in size and development, and they are intelligent.
4. There are two sides of its brain.
5. So when one side of the brain sleeps, other side of the brain stays awake.
6. During dolphin sleep, they keep one eye open to watch, for predatory fish like sharks.
Sources
http://upload.wikimedia.org/wikipedia/commons/a/a6/Bottlenose_Dolphin_KSC04pd0178.jpg
http://simple.wikipedia.org/wiki/Dolphin
金の星社 ちがいがわかる 写真絵本シリーズ どうぶつの赤ちゃん 「イルカ」
ポプラ社 親と子の写真絵本⑧ 「あおいうみのイルカたち」
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