Pumpkins Should Have Gone Extinct

Plants that produce fruit want to be eaten, because that's how they disperse their seeds. Long, long ago, the ancient ancestor of pumpkins evolved to be eaten by megafauna like mastodons. They were too bitter and toxic for creatures like humans. Besides, they had a really hard rind. Only those large animals could open the fruit, tolerate the taste, and properly spread the undigested seeds around with some handy manure for fertilizer.

Then around 12,000 years ago, humans wiped out the mastodons, giant sloths, mammoths, giant bears, and other animals that ate those proto-pumpkins. Those bitter pumpkins weren't appealing to other mammals, so how did they survive to today? They are an evolutionary anachronism, a species that should no longer exist. You might not be surprised to learn that it was because of humans, who do weird things. PBS Eons explains how we got pumpkins even though they should have died out thousands of years ago. (via Laughing Squid)