Grey Heron in a Field

Grey Heron in  a Field

Observation - Grey Heron in a Field - UK and Ireland. Description: Anyone know why they do this? Egrets do it too, I've noticed. Both birds are fine in trees, so what's in it for them to stand in the middle of a field? Food source perhaps (though I don't ever recall having seen them feeding)?

Anyone know why they do this? Egrets do it too, I've noticed. Both birds are fine in trees, so what's in it for them to stand in the middle of a field? Food source perhaps (though I don't ever recall having seen them feeding)?