Koalas are relatively gentle creatures and they will not seek you out. Koala bruises happen when a Koala is rough-housed, often by children who don't understand the gentle nature of these animals. Koalas have strong claws at the end of each paw which they use to climb trees, but their small size makes them no match for an adult human. The claws themselves can be painful if mishandled or stepped on, but this is the only threat that Koalas pose to humans. Koalas are generally quiet creatures who like to blend in with their surroundings. Koala noises come mostly through grunts or chewing, depending on what Koala is doing at the time. Koalas rarely emit other noises except when distressed.