Greyduster a few weeks ago I had this lovely racing pigeon in my garden. It looked in a really bad way totally exhausted. Following online advice I gave it wild bird seed and lots of water. It needs to be in a container at least an inch deep they get dehydrated very quickly.
It had perked up a lot next day. I eventually spotted its number and found out who owned it. It was not far from home but had been caught in bad weather and very cold winds on a 100mile training trip, as had some others in that batch. It took off again after three days and got home ok.
I think Pigeons in towns need to be controlled, their droppings cause an awful lot of mess and chemical damage to buildings. which is expensive to repair. I never feed wild pigeons. The problem is there are very few natural predators in towns to keep their numbers under control, a few more hawks that are not afraid of living in towns are needed..
It's the old question of having natural balances in the food chain. In terms of ecology we shift these natural balances at our peril.
I've got another 'keen'... Ouch!