Because they have something important to say, and they want every animal within five miles (8 km) – the range of a lion’s roar – to get the message. The sole social members of the feline family, lions roar to communicate with the rest of their pack (called a pride). A male lion on patrol will roar to let the females (called lionesses) know that the pride’s territory is free from rogue lions (or lions without a pride), or he might roar to tell other lions to keep their distance. Although not as loud as lions, lionesses roar to call their cubs home or shout for help in the hunt. Tigers, which are solitary animals like all other cats, unleash their roars to convey a simpler message. Keep out of my territory.
Picture Credit : Google