This is a question I pondered. The other day I saw a crow trying to drink from a pool of fresh cow urine. It took a sip, probably didn't find the taste good and flew away.
How do snails or dogs or birds know what is good or what is poisonous and to be avoided?
Then I read this article. In 30 years, storks in Portugal had changed their migrating behavior and their food habits as well.
I guess the answer is partly intuition coming from memories from across generations which they carry in their genes / DNA and just plain experimenting as the storks must have done.
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