BBC News: Birds' genetic secrets revealed in global DNA study

Decoding the Mystery of Multiple Sex Chromosomes and Oviparity in Platypus

The iconic platypus and echidna (monotremes) display a unique mix of mammalian and reptilian features and form the most distantly related group of living mammals. One of their most well-known features is that they lay eggs to produce offspring while secret milk to feed them. Monotremes also have a c...