Bibliography (8):

1. Bumblebees show cognitive flexibility by improving on an observed complex behavior

2. Do monkeys use sex toys? Evidence of stone tool-assisted masturbation in free-ranging long-tailed macaques

3. Cuttlefish exert self-control in a delay of gratification task

4. Idiosyncratic learning performance in flies

5. What insects can tell us about the origins of consciousness

6. Object play in adult domestic cats: the roles of habituation and disinhibition

7. Domestic cats (Felis catus) prefer freely available food over food that requires effort

8. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Bombus_terrestris  :

      https://en.wikipedia.org/wiki/Bombus_terrestris