does anyone know, which animals are mutant (ie. cant speak to each other?)

[dove]

I know squirrels can flash their tails and dogs growl.

But how many animals cant talk, ie tortoise, errrm etc

[Chillum]

I've heard tortoises make a grunting noise when making love to lovely lady tortoises. Giraffes have no vocal chords and are therefor mute.

[gen2]

Ninja Turtles

[Clanad]

This, from The Incredible Giraffe:

A lot of people think that giraffes don't make any sounds, but this isn't true. Usually they're silent, but at times, they do make some noise!
Calves (baby giraffes) bleat and make a mewing call.
Cows (female giraffes) seeking lost calves bellow.
Courting bulls (male giraffes) sometimes let out a loud cough!
Also, giraffes have been heard snorting, moaning, snoring, hissing, and making strange flutelike sounds!

[woofgang]

I think that all mammals and many other living things can communicate, Like the squirrels and their tails (and squirrels make a noise too). I guess that there are loads of mute sea creatures?

[joko]

mutant does not mean mute!

Tortoises emit a kind of high pitched squeak when they are having sex - like someone saying 'heh' in a high voice... very weird.

Do rabbits make a noise???

[pritchard69]

joko beat me to it.

Jellyfish are pretty quiet.