Scientists in Mexico's Laguna Ojo de Liebre, or Scammon's Lagoon, discovered the dead calves, believed to have been miscarried as a result of their disability.
Conjoined twins have occurred in other species, notably fin, sei and minke whales, however, research has not found any published cases of conjoined gray whale twins.
Scientists in Mexico's Laguna Ojo de Liebre discovered the dead gray whale calves.
The carcass is only about seven feet long, versus the normal 12 to 16 feet for new-born gray whales.
Alisa Schulman-Janiger, an American Cetacean Society researcher, pointed out that the twins were severely underdeveloped and wondered whether the birth or stillbirth might also have killed the mother.
The twins' carcass has been collected for study.
Images were posted by the Guerrero Negro Verde Facebook page, with the translated statement: 'Unfortunately, the specimen died. [Its] survival was very difficult.'
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