Patio Life: Large White Caterpillars

Okay, one of my favorite flowers on my Patio/Balcony is Nasturtium, for one thing the flowers are really nice, it grows well quickly and it feeds loads of critters which is what 99.9% of all plants on my patio do.

I have had rapeseed growing before but this year only one showed up, and my nasturtiums didn't reappear at all, and a few weeks back I noticed the Large Whites visiting the patio, so thought 'Well I'd better get something they can lay eggs on'. Went to my local place bought two 3" pots and was ready to plant them the next day when I saw this!
Now you know that no Whites came along and laid eggs over night that hatched out and became caterpillars this big!! The nerve of them selling me Large White butterflies...lol
In any case sadly a couple days later they turned out to be bird food for the family of Sparrow that had been frequenting my patio, and I only had three left as of a couple days ago. Two left home to pupate and one is still feeding up!