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4

Yes, 4 is correct.

But, it depends on what type of creature you're asking about.

Fish: 2 total; 1 in, 1 out.

Birds & Mammals: 4 total; 2 in, 2 out.

Reptiles & amphibians: 3 total; 2 in, 1 out.

Hope this helps : )

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15y ago

What else can I help you with?