If you see a yawning hippo you might think it is sleepy and even cute, but in reality, the yawning of a hippo is a warning sign, it shows the jaws and its long, sharp teeth to demonstrate its strength and aggressiveness. Even the sounds made by a hippo, similar to a deep and demonic laugh, are a warning and do not represent a funny situation. Despite its funny appearance, the hippo is among the most dangerous and aggressive animals of the African savannah, the long sharp teeth can grow to a length of over 50 centimetres. The hippo holds a record, the widest mouth opening of all land animals belongs to the hippo, Hippopotamus amphibius, that can open its jaws up to 180 °.

The lion is the most social of all wild felid species, living in groups of related individuals with their offspring. Such a group is called a “pride”. Groups of male lions are called “coalitions”. Females form the stable social unit in a pride and do not tolerate outside females. Membership changes only with the births and deaths of lionesses, although some females leave and become nomadic. The average pride consists of around 15 lions, including several adult females and up to four males and their cubs of both sexes. Large prides, consisting of up to 30 individuals, have been observed.