Crab spider versus butterflies

29 May 2014

My garden seems to be a dangerous place for butterflies at the moment. I’ve got some periwinkle out, and there is a crab spider hiding in it, which has killed both an Orange Tip and a Wall Brown.

I didn’t realise what was going on at first. I saw the Orange Tip on the periwinkle and just thought “Oh good, another Orange Tip”. It was when I walked past again about an hour later and saw it was still on the same flower that I thought something odd was going on and stopped to have a proper look, and all became clear. This sort of spider likes to lurk in a place likely to be visited by the insects that are its prey, and when they land, will grab them and sink their fangs into the body, injecting them with a venom to kill them, after which it will suck the goodness out of them.

Orange Tip hanging under the periwinkle flower while crab spider sinks his fangs in

Orange Tip being killed by crab spider

I didn’t like losing the butterfly, but spiders have to eat too. However, I walked past again a week later and spotted a Wall Brown butterfly on the periwinkle. I stopped to take a better look immediately, but mainly because I wanted to verify it was a Wall as this would make it the first one of the year, only to find it was also the victim of the crab spider. Within about half an hour the spider had disappeared and the remains of the butterfly were on the ground. This was rather more upsetting, as the Wall is becoming a less common butterfly: it is disappearing fast from inland areas and only hanging on around the coast.

Wall being killed by crab spider

Wall being killed by crab spider

One final photo, to show you a Brimstone which had the sense to keep away from the periwinkle and stick to the honesty close by – as far as I know, it lived to fly away and maybe mate with a female which will lay eggs on the buckthorn I’ve planted at the far end of the garden: it’s about time one did!

Brimstone on honesty flower

Brimstone on honesty flower




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