Do all Bongos have two heads?

They wouldn't be called Bongo's if they didn't.

= Bongo drums - 'Bongos' the drum pair = The bongos are one of the first drums to learn rhythms and sound patterns on, because of its size, its convenient portability, its low price compared to larger drums, and having two drum tones to immediately play with.

The bongos are great, very easy to carry, tune and play.

* http://www.yourworldinstruments.com/bongos-s/23.htm