Rats like to be tickled and they laugh just like humans.
Scientists discovered that same chirping noise is created when they play with other rats .
Cows have best friend and they show sign of distress when seperated. Whenever we see cows, they are seen calm eating grass or looking at some space . We feel them as unemotional but scientists have studied that they have lot of emotions.
There are certain animals who can learn languages like chimpanzees, parrots. Alex is an African parrot, which not only mimics but speaks like humans and also identifies food materials.
Birds chirp in spring. They mostly sing to attract their mates.
Animals also commit suicide. Yes, they also understand mortality. There are many such cases registered. There is one bridge in Scotland which is considered as dog suicide bridge.
Crocodiles cry mostly for biological reasons than emotional ones. For the same reason in case of humans, if someone is pretending to cry or is fake with emotions he is said to have crocodile tears.
Bower bird(male) decorates its nest with flowers, plastic and different decorative materials to impress its females mates.
Elephants grieve and bury their dead. At times they also take revenge for the same. They are civilized and extremely empathetic creatures.
Male pups let female win while playing like humans. The gentlemanly dog behavior is even accompanied with a bow.