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(a) Platypus (Ornithorhynchus anatinus) (Richard J. Whittington©); (b) Spur of an adult male platypus, ~15 mm long (found postmortem; forceps are used to erect spur); (c) Resin cast of a male platypus skeleton, displaying prominent spurs on the hind limbs (Bone Clones©); (d) Ventral surface of a preserved male Tachyglossus echidna specimen, showing spurs pointing inwards on each hind leg; (e) Detail of the spurs in the Tachyglossus specimen shown in (d).
