Which animal has the most extended period of gestation for a bird?

The bird with the longest period of gestation is the Albatross. The albatross can take anywhere from 3 to 5.5 months of incubation to hatch its egg. The albatross is a long-lived bird that inhabits the open ocean, and it can take up to 10 years to reach sexual maturity. It lays only one egg at a time and takes great care of the chick once it hatches, with both parents sharing the responsibility of incubation and feeding.

The extended gestation period of the albatross is due to their need to be able to fly long distances to find food. They lay their eggs on remote islands, and once the chick hatches, it can take up to 5 months for the chick to be strong enough to fly and leave the island. This long gestation period helps to ensure that the chick is strong enough to survive on its own once it leaves the island.