Because they are hippos!
Yes, if you mean the relationship between a mother and its child. Male hippos will fight over territory which can injure/kill others.
Of course, mice can talk to each other.
other hippos
If you live in a fantasy world then yes.
well the male hippos enimes are humans and other hippos what he said ^
Because the people that talk about other people like them
white sided dolphines talk to each other by clicking
yes bacteria can talk to each other
yes they do, in a group of 20-30 with one male
They talk in some way but to each other not to us.
Bugs can communicate with each other, but they can not talk to humans.