The female Blue-footed Booby lays two or three eggs. Both male and female take turns incubating the eggs, while the non-sitting bird keeps a watch. Since the Blue-footed Booby does not have a brooding patch (a patch of bare skin on the underbelly) it uses its feet to keep the eggs warm. The chicks cannot control their body temperature up until about one month old. Eggs are laid about 5 days apart. Blue-foots are one of only two species of booby that raise more than one chick. This may be because of the males specialized diving in shallow waters. They must be fed frequently, so the adults constantly hunt for fish. The chicks feed off the regurgitated fish in the adult's mouth. If the parent Blue-footed Booby does not have enough food for all of the chicks, it will only feed the biggest chick, ensuring that at least one will survive. Boobies may use and defend two or three nesting sites until they develop a preference a few weeks before the eggs are laid. Usually 2 to 3 eggs are laid and 1 to 2 chicks are hatched. The incubation period is 41-45 days. They nest on bare black lava in a small dip in the ground. The female will turn to face the sun throughout the day so the nest is surrounded by excretion. These nests are done in large colonies. The male and female share quite a bit of their responsibilities. The male will provide food for the young in the first part of their life because of his specialized diving and the female will take over when the demand is higher.
info taken from http://en.wikipedia.org/wiki/Blue-footed_Booby