These Blue-and-gold Macaws can expect to live for over 70 years, says Rod Frederick. Rainforests present their inhabitants with a relatively consistent weather and food supply. Over the millennia, birds like these Macaws have adapted to that by producing fewer young and living longer. Birds from more northern climates that contend with inconsistent seasonal weather and shifting food supplies have adapted to the potential of shorter life spans with a greater rate of reproduction. These three rainforest denizens can count on being friends for quite a long time.