Can you help me identify these little beggars please, they've systematically destroyed the unnamed plant that I was trying to grow (I can't remember what is was!!) and I kept leaving them thinking that the birds would just pick them off. But for some reason they aren't, the caterpillars are just multiplying and growing.
What are they please and are they poisenous to the birds?
Thanks as always for your help and feedback, Heather