A yawn is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from lack of stimulation. Pandiculation is the term for the act of stretching and yawning. Yawning is a powerful non-verbal message with several possible meanings, depending on the circumstances. It is also claimed to help increase the state of alertness of a person. The exact causes of yawning are still unknown.
Humans and animals alike all yawn, below are some photos of animals in the act. Many more pictures here
At times nature can be cruel, but there is also a raw beauty, and even a certain justice manifested within that cruelty. The crocodile, one of the oldest and ultimate predators, often considered the "apex predator", can still fall victim to implemented 'team-work' strategy, made possible due to the tight knit social structure and "survival of the pack" mentality bred into the canines