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動物進化ファイル
evolution filevol.-0309
win PC cover image
[ Diver ]
南北アメリカの大平洋沿岸部に生息するカッショクペリカンは、上空からダイビングして喉袋に魚を取込む採餌方法で知られる。これは熟練を要するので、若鳥が餌を捕れず餓死する割合が非常に高かった。しかし近年、羽毛を金属カウルで覆った個体が現れ始め潜水深度や時間が格段に増大し、採餌率も上昇しているという。彼等は飛ぶことを放棄するつもりなのだろうか?
[ Diver ]
Brown Pelicans live along the North and South American coast. They dive into the sea from the upper air to catch the fish inside their throat pouch. A lot of experience is needed to feed them enough so only few young ones can achieve growth. However new types have a cowl over the body instead of the feather,which enables them to dive incredibly deeper and longer than ever. Naturally the ability to get food increases and their survival rate too. Are they losing the skill to fly...?
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