The Sorraia horses that now live in Vale Carapito and Ermo das Águias and that will soon also be introduced to other properties in the Greater Côa Valley rewilding area, have an important mission to fulfil that has been lost over the ages with the extinction of the large wild herbivores in the landscape.

Migrations are one of the oldest processes in the animal world, being seasonal movements from one place to another. There are different reasons why animals migrate. For example, some species migrate to take advantage of seasonal availability of different food sources, others to escape the harsh climate for part of the year, or for breeding reasons. In the Greater Côa Valley there were, there are, and there could be again several migrations of birds, fish and mammals.