Mexico's environment ministry said a record number of grey whales have been born in the country's waters this year, with nearly 1,200 young calves being nursed off the Baja California coast.
The count by the Secretariat of the Environment and Natural Resources doubles the number of calves Mexico spotted last year and six times the number it saw in 2010.
The birth rate has not been this high since 1996, when officials began measuring the migration of the whale from the northern Pacific coasts.
A statement said the increase in reproduction had to do with better climate and temperature of the ocean.
The grey whales breed in the Hare's Eye Lagoon on the Pacific side of the peninsula and are listed as endangered species in Mexico.