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an organ that secretes substances inside or outside the body
lands in female mammals that secrete milk
the sheet of muscle located beneath the lungs
a hollow, muscular organ in which offspring develop
a mammal that carries its young inside the uterus until development is almost complete
an organ in the uterus that nourishes the young inside it
the time during which placental mammals develop inside the uterus
a mammal in which the young have a short period of development within the mother's body, followed by a second period of development inside a pouch made of skin and hair
a mammal that reproduces by laying eggs
fierce-looking, heavy-set animals that had features of both reptiles and mammals