Locals harvest mortinios (blueberries) at the northern outskirts of the Cotopaxi volcano, one of the world's highest active volcanoes, at El Pedregal, in Ecuador, October 22, 2015. Ecuadorian authorities are monitoring activity at Cotopaxi volcano, which prompted Ecuador's President Rafael Correa to maintain a yellow alert for eruptions as bursts of ash keep spewing from the snow-encircled crater of the volcano and falling in gusts on residential communities. REUTERS/Guillermo Granja