Scientists discovered that newborn chicks of white-necked jacobin hummingbirds resemble caterpillars.The plumage of the chicks, with long, thin, yellowish feathers on their backs, resembles caterpillar hair.This mimicry serves as a defense mechanism and helps protect the chicks from potential predators.The white-necked jacobin hummingbirds build their nests in exposed areas, making them easy prey.