This animal experiences approximately 8 hours of REM sleep per day, which is the highest of any mammal. Like snakes, certain defensin-like proteins are found in this animal's venom. Both males and females have ten sex chromosomes, and they may be the only mammals that follow the ZW sex determination
This animal experiences approximately 8 hours of REM sleep per day, which is the highest of any mammal. Like snakes, certain defensin-like proteins are found in this animal's venom. Both males and females have ten sex chromosomes, and they may be the only mammals that follow the ZW sex determination system, a characteristic shared with birds. They belong to genus Ornithorhynchus, and other similarities to birds, including the use of a cloaca for reproduction, show these animals' early divergence from the placentals and marsupials. For 10 points, name these primitive mammals, certain egg-laying monotremes with duck bills.
This animal experiences approximately 8 hours of REM sleep per day, which is the highest of any mammal.
duck-bill platypus [or Ornithorhynchus anatinus]