This videos shows the courting ritual of Japanese Puffer Fish. In order to court a female puffer fish, a young male will attempt to construct a sand structure as geometrically perfect as possible. These fish will spend hours tidying up their work until it becomes a beautiful masterpiece. The more expertly done, the more likely the male will be in attracting a female.
This article provides an example of circadian rhythm. Like many animals in that inhabit the arctic, Reindeers have a very strange and informal circadian rhythm. In fact, reindeers that reside in the arctic have the ability to mute their circadian clock during the dark winters of the north. Yet, they are able to return to circadian rhythm during the breeding season, when it is most necessary to follow.
This article details a study done on rats to show their spatial learning. Dumont and colleagues tested how rats determined where they had previously hid their food, by seeing if rats remembered based of size of landmarks or other indicators such as color. It was proven that rats recognize the size of things from previous interactions with landmarks.
This video shows an example of a fixed action pattern. Greylag Geese attempt to roll any nearby egg into their nest by using their lower beak. A greylag will also attempt to roll in any object with a similar shape, color, or size into their nest. Even if the egg/object is taken away from the goose, it will continue its rolling motion on the now, nonexistent egg.