Gorillas:

Gorillas are very similar to us genetically - 98% of their protein-encoding DNA (the DNA we typically refer to as "genes") is the same as ours.
Gorillas are social - they live together in groups (also called "troops") of up to 30 individuals.
Gorillas can live to ~40 years old.
At ~12 years old, male gorillas start to show grey hairs on their backs, which is why they are called "silverbacks".
Adult male gorillas are incredibly strong - about 10x stronger than the average human - and are capable of bending iron bars. They have a stronger bite force than lions.
Gorillas are one of only a few animals (including us) that are known to use tools.
Despite their large size, a gorilla's diet consists mostly of shoots, fruits, and leaves; they are also known to eat snails, ants, bark, and some small mammals. Adult males have to eat ~45 lbs of food per day, which means they spend a lot of time foraging.

Gorillas are very social and young gorillas like to play. They invite each other to play in a couple of ways. One is spinning around. This signals others that what comes next is just play.

When my family was in Rwanda visiting wild gorillas, one young one ran up, grabbed my dad’s coat and spun him around. Then he ran by and slapped me on the leg. He just wanted to play. Visitors are not allowed to get close to the gorillas (this is to protect them from germs), but we were lucky to have that gorilla interact with us.