[6] Mating occurs in the autumn, but the embryo doesn't begin to grow until the spring due to delayed implantation.

[2] An immense breeding colony once existed at the Widderin caces near Skipton, as the Chief Protector of Aborigines in Victoria, George Augustus Robinson, discovered in the mid 1840s.

[11] Another possible cause of decline of this subspecies is guano mining in Australia, which frequently involved changing the shapes of caves to make extraction easier.

[2] Guano mining changed the cave environments by lowering their humidity, which possibly made them inhospitable to bat colonies.

[12] It is unknown if pesticide or heavy metal exposure is contributing to the decline of this subspecies, although DDT and its related compounds DDD and DDE have been found in their guano, livers, pectoral muscles, brains, and fat tissues.

[13] A major concern for conservation of this subspecies is the potential arrival of white-nose syndrome, which has killed millions of bats in North America since its introduction in 2007.

[2] Most critically, researchers are seeking to determine what is responsible for the drastic decline of the subspecies, so more focused conservation actions can be implemented.