1. Elephants often recognize keepers and exhibit affectionate behaviors like trunk touches or rubbing their bodies against the fence.

2. Gorillas have been known to communicate with visitors through sign language, showing remarkable intelligence and interest in human interaction.

3. Penguins waddle up to people at the edge of their enclosures, hoping for a friendly pat on their heads or bellies as they swim by.

4. Dolphins leap high out of the water during shows, seemingly performing tricks just for our delight proving that they enjoy engaging with us too!

5. Hippos may not look cute but watch them yawn wide while floating peacefully near visitors; it's an endearing behavior unique to this gentle giant species at zoos today!