On the southern end of these beaches is the village of Barra de Potosí. There is a lagoon here, called Laguna de Potosí and islets called Morros de Potosí. The lagoon area has a large mangrove estuary filled with bird wildlife. Birdwatching, kayaking and fishing are popular here. The lagoon opens to the ocean and the beaches contain many "enramadas", palm-thatched outdoor restaurants. Many of these enramadas are decorated with colorful paper or plastic cutouts, especially during the Christmas season. The Morros de Potosí are offshore and is a popular place for snorkeling, with red-billed tropicbirds, brown boobies and brown pelicans nesting on the rocks. In the winter season the bay hosts humpback whales, mother/calf pairs and some males are seen leaping from the water. There is a whale study project, Whales of Mexico, that takes place in the winter as well.