Ostrich

One ostrich egg equals about 24-30 chicken eggs and weighs up to 3 ½ lbs. The shell is thick enough to withstand an adult bird weighing up to 345 lbs sitting on it.

In a flock, the dominant ostrich hen lays her eggs first. The other hens lay theirs around hers. The male and the dominant female incubate all the eggs for the group, but the ones in the center have the best chance of surviving.