Mammals of Australia introductions of placental mammals into Australian fauna were about (rats), several thousand years ago (dingo), and 200 years ago (many species); the last two were made by humans. Some claims were made about placental mammal fossils from the Eocene of Australia, called "Tingamarra". These claims are based on only one found tooth having some characteristic features of condylarth, and were discussed widely. But both the age and placental nature of these fossils were challenged by other researchers. Monotremes are mammals with a unique method of reproduction: they lay eggs instead of giving birth to live young. Two of the five
The Marine Mammal Center is unregulated and results in seizures. Repeated exposure will cause repeated activation, ultimately burning out these neural pathways and causing permanent brain damage; specifically, atrophy of the hippocampus. Domoic acid is the same biotoxin that causes amnesic shellfish poisoning in humans. Another discovery by the Marine Mammal Center, in collaboration with the University of Florida, is that seal pox is distinct from pox viruses isolated from other species. It is unrelated to chicken pox or smallpox. Also being investigated is the increased incidence of leptospirosis, a bacterial pathogen that can acutely damage the kidneys of marine mammals. The Marine Mammal