The egg of the white tern is small, elongated, and white in color, typically about the size of a marble. It is laid directly on bare branches, ledges, or sometimes on the ground, with no nest structure to protect it. This makes it particularly vulnerable to predators and harsh weather conditions. The white tern's nesting strategy is unique in that it doesn't build a traditional nest; instead, the parent birds use their feet to cradle the egg and keep it safe. The eggs hatch after about a month, and both parents share the responsibility of guarding the egg and later feeding the chick. The white tern's method of parenting is fascinating because the chick will often be left alone on the branch for short periods while the parents forage for food.
A White Tern egg, sitting on a bare branch on an uninhabited motu in #Tikehau, in the Tuamotu atoll. This egg is uniquely adapted to the bird's wild and crazy nesting strategy. White Terns have evolved to lay their eggs directly on open branches or rocky ledges. #evolution