Complex sentence: In a number of species, males perform calls during mating rituals as a form of competition against other males and to signal females, including hammer-headed bats, red deer, humpback whales, elephant seals, and songbirds.
Split into simpler sentences: In a number of species, males perform calls during mating rituals as a form of competition against other males and to signal females. Examples include hammer-headed bats, red deer, humpback whales, elephant seals, and songbirds.