Consonants

Hawaiian has 13 letters, only seven of which are consonants (HKLMNPW). That puts it in second place, behind Rotokas (PTKBDG), for the least consonants.

One language near Istanbul, Ubykh, has 80. Actually 84, but four of them are in borrowed words only. Impressive. I won't be learning that language anytime soon... (apparantly, it's a dead language as of 1992 anyway.)

But it gets worse. One of the clicky languages of Africa, ǃXóõ, has 112 sounds, 81 of which are consonants. (Just under 50 of them are clicks.) There are still ~4,200 speakers of this language, too.

When you have to be that careful with your mouth, I imagine speech must be a religious experience.