The ginkgo tree is endangered. Its nuts have toxins no an... | funfact.wiki

The ginkgo tree is endangered. Its nuts have toxins no animal but humans will eat, making wild reproduction nearly impossible. Appearing in the Permian period, it outlived every related species and is now the sole survivor of its entire taxonomic division.

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Avocado seeds are so large only massive animals could eat and spread them. Until 10,000 years ago, mammoths and ground sloths did this, but after their extinction, avocados lost their dispersers. Had humans not cultivated them, avocados might have vanished.

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