Sharing is the joint use of a resource or space. In its narrow sense, it refers to joint or alternating use of inherently finite goods, such as a common pasture or a shared residence. It is also the process of dividing and distributing. Apart from obvious instances, which we can observe in human activity, we can also find many examples of this happening in nature. Such as this video.
The baby is eating some snacks with his mom and cockatiel, and while it seems that at the beginning the baby was not very fond of sharing the snaks, he gave up and let his cockatiel-brother eat them! Here is the video, enjoy!