Mammals with short gestation and further development of young usually in a pouch.
“  The peradectids are a problematic family of marsupials placed in the didelphimorphs with...Peradectidae
“The thylacine (Thylacinus cynocephalus), also known as the Tasmanian tiger, isn't a tiger at...Thylacine
“  The thylacoleonids are specialized members of the diprotodont marsupials. Like them, their...Thylacoleonidae
“  The didelphomorphs are a group of American marsupials that include modern opossums...Didelphomorphia