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Mammal
Whale (origin Old English hwæl from Proto-Germanic *hwalaz) is the common name for various marine mammals of the order Cetacea. The term whale sometimes refers to all cetaceans, but more often it excl ...
Dbpediathing
Eels are elongated fish, ranging in length from 5 centimetres (2.0 in) to 4 metres (13 ft). Adults range in weight from 30 grams to over 25 kilograms. They possess no pelvic fins, and many species als ...
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