Ravens are regarded as one of the most playful and naughty of all avian species. They like harassing dogs and cats by pulling their tails or sneaking up on them and cawing loudly in their ears. Ravens have been observed to play catch-me-if-you-can games with wolves. They even like playing at sword fights, by breaking off bits of twigs and bark and fighting with each other. They like to slide in the snow, hang from places upside down and in snowy areas, they even push snow from roofs onto humans below.