Macaroni penguinAnton Ivanov/Shutterstock
More than 90 percent of birds are monogamous, but none of them show affection quite like macaroni penguins. These adorable couples dance when they see each other, called “an ecstatic display.” They puff up their chests, swing their heads side to side, and make a gurgling-like sound. Once their baby is born, the father looks after the chick while the mother hunts for food. Check out these amazing photos of baby animals and their mamas from National Geographic.
Sandhill craneNagel Photography/Shutterstock
Humans have love songs and poetry, but sandhill cranes have “unison calling” to profess their bond to the world. Female cranes squawk twice and the male cranes respond with a single squawk. We doubt it would have the same effect on humans.