I found an old quote.

Dennis: Everyone probably knows that vegetables and fruits are especially grown delicious so that they are eaten by some animal and then pumped them with seeds elsewhere, promoting their spread. But who does chili pepper count on?? to

Chili pepper contains seeds that are digested in the intestines of mammals, but birds do not digest them. It is spread only by birds. Smart nature has added to the pepper a substance that is not felt by birds, but is very sharp and frightening for mammals.