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. 2013 Nov 12;8(11):e79092. doi: 10.1371/journal.pone.0079092

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© 2013 Wong et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

1) An echidna (image taken from http://faunafemales.wikispaces.com/Echidna) and a dissected crural gland-spur apparatus from an adult male echidna. Photo was taken by William Krause and reprinted with permission from reference 2. Note that the main duct linking the crural gland and spur is shorter in the echidna than in the platypus. The spur (highlighted by an arrow) is not able to be erected in the echidna. 2) A platypus (image taken from http://faunafemales.wikispaces.com/Platypuses) and a dissected gland-spur apparatus taken from an adult male platypus. The original photograph was published by Krause in reference 2 (licence number 3184480567659).