Hot Peppers

[desertanimal]

Here's a title of a Nature paper that explores this very issue. Didn't read it (am on my phone), but it seems pretty targeted at your question. "Seed dispersal: Directed deterrence by capsaicin in chillies." Abstract says capsaicin deters some animals (the new world monkey seed predators like Saki monkeys spring to mind) without deterring good seed dispersers.

[desertanimal]

The real mystery, though, is who were the seed dispersers of undomesticated citrus.

[Vanda lover]

Birds don't have saliva like other animals do and many of them love hot peppers. They are in many parrot foods. They shouldn't be fed to dogs or cats, they can upset their systems.

[katrina]

Originally Posted by Laserbeak

I thought fruits were supposed to get animals to eat them so their seeds, which pass through the gut intact, get spread far and wide along with a side of fertilizer too!

Right there is the rub...if humans (or most any mammal) eats the pepper the seeds it will likely get destroyed by the chewing. Therefore, the plant evolved a mechanism (capsaicin) to cause the mammals to avoid them.

As already pointed out...birds are the best at dispersing seed. 2 reasons...they don't chew and they fly.