Well, why? And the herbivores who are nidicolous are small herbivores like rabbits. With the one exception of sow. Why? And, on the other hand, why are carnivores nidicolous? Kittens, puppies and cubs are born blind. Sure - small herbivores like hares and sheep are popular prey for big carnivores. But a lot of herbivores are big compared to carnivores present in their environment. A cow is big and horny compared to a sow. For a wolf or a bear, a cow should be a more daunting target - and an elephant even more so. If an elephant made a nest, who would dare bother her in her nest? Actually, it would seem to me that carnivores and even omnivores should be less, not more suited for nesting than herbivores. For the food of carnivores is capable of fleeing them or migrating for their own reasons. If a ***** has blind puppies in den, and the potential prey flee the surroundings in fear of the *****, the ***** and her puppies would starve until the puppies are big enough to leave the nest in pursuit of their prey. Whereas a cow, if she wanted to nest, could verify the presence of enough grass around her nest, and see to it that no one else eats it until her calf is ready to leave the surroundings. As for omnivores, since a sow being omnivore cannot eat grass like a cow does, but is limited to more nutritious and scarce foods, she also needs a bigger home range than a herbivore of same size. And for the example of carnivores - if a bear could bear a cub as big and mobile as a newborn calf, they would not be confined to vicinity of a den, but could migrate in pursuit of prey. So why are herbivores so overwhelmingly nidifugous, and carnivores nidicolous?