Large White caterpillars

Over the last 3 week during the recent hot weather I have been counting regular numbers of Large White caterpillars or larvae on the Burrage centre car park at work at the Hospital, normally the counts have been in high single figures but reached a record of 26 one day over a week ago and 5 were still crawling along on Friday the 13th. Also today, Saturday the 14th around 20 Jackdaws flew over chasing a Rook flying overhead and north over the garden.