Well, I suppose, in a soundless environment, with acute hearing, and with your ear next to 17 slugs or snails having a party on lettuce or something, it might be so. They do make a noise when eating, but its usually only audible with a high intensity microphone placed very close. I've certainly heard a wasp chewing on the woody stem of a sunflower when its very quiet, but that's relatively noiser than a snail eating a lettuce leaf. Maybe she's winding you up, or maybe she geniunely believes she can hear them...

well sometimes I can hear a faint rasping it depends what is near and reflecting the sound. it drives my oh mad when I say ssh can you hear that...... and he cant. But I do have a good hearing range much to the amazement of the audiologist.

Thanks, Am passing your replies to my daughter to get her reaction.

Daughter still insists she is right and is going to catch one or 2 Aand bring them indoors with lettuce leaves so I can hear them for myself.

Whether you can hear them or not depends on the acuity of your hearing I'd imagine, but fun to see if you can...