ARGININE or lysine vasopressin is found in the pituitaries of most placental mammals and arginine vasopressin has been tentatively identified in a monotreme1 and in four species of marsupials1,2. We have investigated antidiuretic activity in the pituitary of a young koala bear (Phascolarctos cinereus), which is of interest because this animal is rarely, if ever, known to drink, its water intake being derived solely from eucalyptus leaves.
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YESBERG, N., BUDTZ-OLSEN, O. & SHARPLES, K. Antidiuretic Activity in the Pituitary Gland of the Koala Bear. Nature 216, 916 (1967). https://doi.org/10.1038/216916a0