Because they are hippos!
Because Hippos don't have wings.
If you live in a fantasy world then yes.
Hippos talk to each other by opening there mouth and like screaming out like a little voice. The males talk louder then the females because the females have soft voices.
you cant talk on crossfire
You cant talk on pet party
hippos
Why cant i talk on one topic
You cant.
Nope.... it cant
They cant talk.
it cant talk
The collective nouns are a bloat of hippos, a crash of hippos, or a herd of hippos.