One of ours, a black rock called chicken tikka, is the only one who comes in the veg patch. she has caused no problems at all - if anything she's really helped. she keeps the caterpillars down, adores slugs and (this is the best bit) helps dig potato's up. she scratches the earth to uncover them. funny thing is, she only comes to the veg patch when she see's me going there so all good fun. I dread to think what state it would be in with the whole lot of them there though.