Order Monotremata
![](images/mtm_slideshows/316287607_d72563eabe_b.jpg)
EchidnaFamily:Tachyglossidae
Photo: Timmy Toucan@flickr.com License: Creative Commons attrib/noncom/sharealike
![](images/mtm_slideshows/3030610443_4137377371_b.jpg)
EchidnaFamily:Tachyglossidae
Photo: Icriding@flickr.com License: Creative Commons attrib/noncom
![](images/mtm_slideshows/63738977_adaf18c994_b.jpg)
EchidnaFamily:Tachyglossidae
Photo: ausemade@flickr.com License: Creative Commons attrib/noncom/sharealike
![](images/mtm_slideshows/1941622146_9dad93cf94_b.jpg)
EchidnaFamily:Tachyglossidae
Photo: JIGGS IMAGES@flickr.com License: Creative Commons attrib/noncom/noderiv
![](images/mtm_slideshows/2930551094_ac734cc6a9_o.jpg)
EchidnaFamily:Tachyglossidae
Photo: aardvaark@flickr.com License: Creative Commons attrib/noncom
![](images/mtm_slideshows/2264821638_005026588b_o.jpg)
EchidnaFamily:Tachyglossidae
Photo: aardvaark@flickr.com License: Creative Commons attrib/noncom
![](images/mtm_slideshows/232543582_fe2c034666_b.jpg)
EchidnaFamily:Tachyglossidae
Photo: Valley_Guy@flickr.com License: Creative Commons attrib/noncom
![](images/mtm_slideshows/374210032_37ab25b70b_b.jpg)
Duck-billed platypusFamily:Ornithorhynchidae
Photo: Small@flickr.com License: Creative Commons attrib/noncom/noderiv
![](images/mtm_slideshows/77775570_a51aebde61_o.jpg)
Duck-billed platypusFamily:Ornithorhynchidae
Photo: marj k@flickr.com License: Creative Commons attrib/noncom
![](images/mtm_slideshows/23944676_6dac487fd4_o.jpg)
Duck-billed platypusFamily:Ornithorhynchidae
Photo: alumroot@flickr.com License: Creative Commons attrib/noncom/sharealike
![](images/mtm_slideshows/2480739340_3b1614026a_o.jpg)
Duck-billed platypusFamily:Ornithorhynchidae
Male duck-billed platypuses have large venomous spurs on their hind legs. Photo: Stowe Boyd@flickr.com License: Creative Commons attrib/noncom
2 Families, 5 Species
Spiny anteaters, duck–billed platypus
Australian region
Egg–laying, cloaca present, mammary glands without teats
2 to 10 kg