Kestrels are one of our best known bird of prey; a familiar sight hovering over the side of the road, on the lookout for small mammals like field voles which are their favourite food. Kestrels are a little smaller than a pigeon and can be found in all kinds of habitats from open countryside to towns and villages. They nest in holes in trees, old buildings and abandoned crows nests, laying between four and five eggs, which both parents will feed when hatched.