31. Monotremes , egg-laying mammals, lay soft-shelled eggs similar to those of reptiles.32. "Radio Protector " was released as a 7 " single in February 2006 on Monotreme Records. 33. Monotremes and marsupial moles are the only mammals in which the penis is located inside the cloaca.34. Mammalian females bear live young ( with the rare exception of monotremes , which lay eggs ). 35. The only orders of mammals that are known to demonstrate electroception are the dolphin and monotreme orders. 36. Porcupines'spiny protection resembles that of the unrelated erinaceomorph hedgehogs and Australian spiny anteaters or monotreme echidnas. 37. Echidnas evidently evolved between 20 and 50 million years ago, descending from a platypus-like monotreme . 38. Understanding the evolution of such a system may have implications for solidifying the true ancestral lineage of monotremes . 39. The monotreme we saw everywhere is the echidna, a little quilled animal who looks something like a porcupine. 40. However, the five species of monotreme , the platypus and the four species of echidna, lay eggs.
