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> How does that prove milk is good for us? Or for them?

Such proof was neither requested nor attempted. The challenge I responded to was, "Name one mammal besides humans who drink milk as adults?"

Clever cats have domesticated their humans (who then domesticate cows) to provide milk on a regular basis. ;-)

When a predator eats a pregnant prey animal they will consume its milk.

It doesn't happen very often but it could still contribute more than we think.

How does the original question prove that it isn't healthy for us?