Poison frogs in the Amazon rainforest
These amphibians are often small and beautiful with their striking colors such as red, blue, yellow and black. You would like to pick them up like that and look at them from all sides.
But this is definitely a bad idea. Because they are toxic. Some even extreme.
With their colors, as a defense, they warn the smaller predators that may attack them that they are poisonous.
After generations of evolution, they know better. They really won't bite at these little brightly colored animals.
Of course, the natives in the Amazon rainforest also picked up this poison centuries ago.