Every species has a unique relationship with time, which is seen in those animals’ respective lifespans, gestation periods, birth intervals, brood development, and internal clocks. Time touches every aspect of life, from major life periods such as mating seasons and migrations, to daily functions such as the time of day to hunt and rest.
One common theme in nature is the interconnectedness among species, with each species having its own unique relationships with others. These relationships are along a spectrum of beneficial to detrimental, and symbioses in particular and their corresponding effects hold significant importance in the lives of the species involved.
In ancestral animals, such as fishes and reptiles, a robust and pervasive form of integument–scales–arose and has a variety of functions, including protection and locomotory assistance.