I actually support this. It sounds like a really nifty idea.
When you think about animals in real life, yes, some do only lay a single egg in a single place, but there are also those that lay many eggs in a nest. It seems a bit weird that creatu lay all their eggs seperatly, and I think this idea could bring a bit more realism into the game.
It would also be good if it was a different number of eggs in a nest depending on the rarity species. Maybe rare species (under 1 % rarity) will only lay one egg at a time so you can't find a nest of eggs for that species.
But other, more common species (30% rarity and higher) may lay a huge number of eggs so there could be lots of eggs in the nest.
And a species in the middle with kind of moderate rarity (1 - 20% rarity) would have just a few eggs in the nest.
There could even be a note on the nesting habits of a species in it's diion.
Maybe there could be like a 5% chance that you will find a nest, which is 1 in 20 egg finds.
Just throwing my ideas out there.