Jackie and Galadriel 1 day, 21 hours ago
I think the logic is that critters drop seeds to attract the next critters to be unlocked. So ordinary critters drop rainforest seeds, then once you start attracting rainforest critters, they drop the enchanted seeds so that you can attract endangered critters. But there is nothing beyond endangered, if you get what I mean, so no new seeds to be dropped.
Also, the endangered critters are hard enough to attract and spot as it is. If they dropped valuable seeds, there would be even more competition to spot them, and it would make it even harder to spot whatever you needed.
Don’t wish too hard for things, sometimes what you wish for has an unexpected catch …