Who spends more bird or reptile energy on each offspring?

Both reptiles and birds take care of their offspring. But birds spend more energy on it. The point is that the birds must find food for the chicks and deliver it. It is also necessary to feed each chick. Sometimes male and female birds share responsibilities, as it is necessary to protect chicks from predators. Moreover, it is necessary to take care of the offspring even before it appears. Birds hatch eggs for a long time. Sometimes it is done exclusively by males – such as emperor penguins. In some species, the male and female change periodically.