Lesser kestrels searching food

As other years now it is possible to observe in the region of Bricia (Burgos province) and the environs of the reservoir of the river Ebro, groups of Lesser kestrels (Falco naumanni), that move of their habitual breeding areas towards zones where the abundance of grasshopper seems to be that he is greater.
It is easy to observe groups not very numerous, 8, 12... looming, perched or to fly around by zones of low vegetation, arable lands, fallow lands... in search of his food.