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Why do some marine mammals (like seals and walrus) spend so much time out of water, but other animals like whales and dolphins have to stay in the water to survive?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why do some marine mammals (like seals and walrus) spend so much time out of water, but other animals like whales and dolphins have to stay in the water to survive?	2
Why is the maximum size for the largest spiders that exist around the size of a dinner plate?	1