larvae in birdbox1 Jan 2012

larvae in birdbox1 Jan 2012

Observation - larvae in birdbox1 Jan 2012. Description: (North Bristol) These larvae were quite a bright yellow, the biggest about 3 cm long and 0.5 cm wide but there were some tiny ones. Found in our birdbox when cleaning it out. They clearly munch wood as they had made several impressive gouges in the wood

(North Bristol) These larvae were quite a bright yellow, the biggest about 3 cm long and 0.5 cm wide but there were some tiny ones. Found in our birdbox when cleaning it out. They clearly munch wood as they had made several impressive gouges in the wood of the birdbox - some are visible on the right in the second photo - and they had spun a very strong, sticky mat(visible in both photos) which had practically sealed the lid of the birdbox shut - some force needed! Not quite the tenants we were expecting. Any ideas anyone?