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Walrus 作者: Mind Map: Walrus

1. habitat

1.1. prefer a habitat with a gravelly bottom

1.2. air temperature is about -15º to +5ºCnode

1.3. prefer snow-covered moving pack ice or ice floes to land.

2. distribution

2.1. Pacific walruses inhabit the Bering, Chukchi, and Laptev Seas

2.2. Atlantic walruses inhabit coastal areas of northeastern Canada and Greenland.

3. adaptation to aquatic environment

3.1. swimming

3.1.1. speed of 4.3mph

3.2. diving

3.2.1. stay submerged for 10 mins