Funnily enough they're toxic to all remaining dinosaurs.
reply> Avocado. I heard it was dinosaur food.
replyNope, and this is trivial to check. Source: https://en.wikipedia.org/wiki/Avocado#Taxonomy_and_evolution
The proposed seed dispersers are now-extinct mammalian megafauna. Much more recent than the dinosaurs - 10k to 100k years ago.
A great related article on mammalian megafauna and plants. https://www.americanforests.org/article/the-trees-that-miss-...
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