To a certain extent, your definition of "intelligence" may shape the types of demonstrations by animals you cite in your essay. However, there are many examples of behaviors exhibited by many different species that could be considered.
Recognition of location and communication of such information to others, demonstrating spatial cognition, is an essential ability for bees and ants, since both leave their "home" to collect food from distant sources that have been located by others and then return, bringing food back to those in the ant hill or bee hive.
Many species of apes and chimpanzees have demonstrated their ability to make and use tools in order to accomplish work, such as gathering food and, in 2007 observations, for hunting.
Researchers have demonstrated that many animal species have elaborate systems of communication within their species, and some animals have acquired means of communicating with their human caregivers through training and experience.