Supongo que sirven para publicitar a empresas de la isla, me parece una forma muy original.
This weekend I went to la calle Triana (Triana Street) in Las Palmas de Gran Canaria and I saw there was an exhibition about cows. You should go to see it, its so nice.
I guess that it is used to advertise businesses on the island, I think this is a very original way.
