Monthly Archives: May 2022


A few days ago I went for a walk in the city centre of Cambridge and as luck would have it it was a day when the grounds of Trinity College were open to the public. I crossed the river Cam over the Garret Hostel Bridge by Trinity Hall and looped back through Trinity College to recross the river over Trinity College Bridge.

From Trinity College Bridge looking back to Garret Hostel Bridge

It was a beautiful warm sunny morning and it’s a very green part of the city, and the grounds of the ‘backs’ of the colleges are surrounded by drainage channels, so on a day like that I’d expect there to be lots mini beasts buzzing around over the water and feeding on all the open flowers.

Drainage channel between Trinity Hall and Trinity College

With so much water lined with uncultivated banks adjacent to other areas which had been cultivated to maximise the number of flowers it should have been humming with bugs and and the birds that feed on them.

Flower beds and gardens of Trinity College

It’s a lovely place to spend time on a sunny morning but the almost total lack of insects was worrying. Along the drainage channel above I saw no insects at all and in the flower beds and gardens of Trinity I counted three butterflies – two small whites (I think), one holly blue – and two bumble bees. There was also very little birdlife apart from half a dozen jackdaws that were flapping around the lawns.

There have been a lot of news articles in recent times about how climate change is causing a catastrophic decline in insect numbers, and there seems to be debate about what’s really going on; but the almost total absence of them on a sunny morning in somewhere as green as the ‘Backs’ in Cambridge made me think that there is a problem here.

St Johns College from the gardens of Trinity College
Punters on the Cam along the Backs

It’s a beautiful place but maybe not as green and biodiverse as I thought it might be. Or should be.