I saw a video on the Internet two days ago. The world’s endangered animal whales in the zoo are eating fish. The video is a minute and a half long. Big bird that can grow up to 1.5 meters is not a fish that has been eaten into the bucket. I was fascinated by this amazing big bird as it slammed awkwardly. Searching for it, I accidentally discovered that this seemingly stupid "staying bird" has a very cruel survival choice. In short, this bird, which looks like a prehistoric animal, only has two eggs at a time, and the mother only raises the one that hatched first. In the world of whales, the "first child" has an unshakable position. At 3 weeks of age, the young chicks eat and drink "Lazard" depends on the mother. The mother only gives the boss food and water, and the second child is just a "prepared tire" to prevent the boss from dying halfway. Under this cruel setting, the boss can deliberately bully the second child and get rid of the fluff that has just grown out of it. Just