Talk:Harpy/@comment-38531539-20190315082722/@comment-27045866-20190315195454

Laying unfertilized eggs does happen in other birds, while the frequency was selected for and highly ramped up in domestic chicken, geese, quails, whatever. It's not something scientists engineered. It happens in nature, just at a slower pace. Even humans will periodically release an egg and it will pass outside the body if it isn't fertilized. Only in humans the egg is microscopic.