"Science, Grade 4Archived 2017-03-24 at the वेबैक मशीन," Carson-Dellosa Publishing, 2012, ISBN 978-1-62442-183-9, ... The platypus is often called a living fossil. Although it is classified as a mammal, it has characteristics of both mammals and reptiles ...
"Platypus," Tom Grant, Csiro Publishing, 2007, ISBN 978-0-64310-275-0, ... Especially during the breeding season when the crural glands are enlarged, venom sometimes is seen exuding as drops from the tips of the spurs of male platypuses during handling. It is a clear, slightly sticky liquid ...
"DNA and Biotechnology," Molly Fitzgerald-Hayes and Frieda Reichsman, Academic Press, 2009, ISBN 978-0-08091-635-4, ... unlike typical mammals that have lost their reptilian features during evolution the male platypus has retained the ability to produce venom in the spurs on its hind legs ...
"Science, Grade 4Archived 2017-03-24 at the वेबैक मशीन," Carson-Dellosa Publishing, 2012, ISBN 978-1-62442-183-9, ... The platypus is often called a living fossil. Although it is classified as a mammal, it has characteristics of both mammals and reptiles ...
