July and August are the months of high summer. Blossom turns to fruit, birds moult and forget how to sing. The dominant sound along the river is the buzz and hum of insects.

The biggest river-side insects are almost honorary birds: You can watch them through binoculars and photograph them sitting on your rod; and they now have English names so you don't need to know Latin. They are relatively easy to identify and there are not too many species to worry about. Best of all, there are a number of recent fields guides to help you.

The "Field Guide to the Dragonflies and Damselflies of Great Britain and Ireland" is published by BWP and covers resident and migrant species. It is written by a former neighbour of mine, Steve Brooks, who now works at the London Natural History Museum. Every now and then his book has to be updated because these insects are always on the move. Maps have to be redrawn and new species arrive in the UK almost annually these days.

Steve took a walk around the carp lake where he was as surprised as I would be to spot a Norfolk Hawker. Now this species is confined to the Norfolk Broads and a bit of Suffolk so in his place I would have decided that I was mistaken, but Steve took the view that he knows what he's talking about so it's a male Norfolk Hawker!  I'm guessing that this is the first record for Cambridgeshire. The nearest breeding site is probably 80 miles away at Strumpshaw Fen, near Norwich.

Actually its quite an easy beast to identify. It looks like a Brown Hawker but instead of the wings being ginger, they are clear. In Norfolk I have seen them flying along water courses chocked with Water Soldier. Is it a co-incidence that the carp pond also has huge rafts of this plant?

I have been down to the lake several times since, in search of this dragonfly, but it seems to have given up on finding a mate and moved on. Perhaps it is now the first ever Norfolk Hawker to visit Bedfordshire.