These pictures show several pairs of Eurasian Griffon Vultures arranging their nests, by adding new sticks and small branches with green leaves, probably from cork-oaks.
We can see in some images only one vulture stealing nest materials from other nest before to leave it.
This is an usual behaviour between them, like in numerous bird species.
They carry materials in talons or bill, according to the type of vegetation.
While adding the sticks, one of them forms the cup by crouching and pushing the sticks with the breast.
The laying usually occurs in early February.

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