Since it first became known to European scientists and naturalists in 1798, the platypus has been the subject of controversy, interest and absolute wonder. Found only in Australia, the platypus is a mammal that lays eggs but, like other mammals, it has fur and suckles its young on milk. Many early biologists who visited the British colonies in Australia, including Charles Darwin, went out of their way to observe this remarkable animal. In Australia today the species is considered to be an icon, but one that many Australians have never seen in the wild. This book presents established factual information about the platypus and examines the most recent research findings, along with some of the colourful history of the investigation of its biology. This completely updated edition covers its anatomy, distribution and abundance, breeding, production of venom, unique senses, ecology, ancestry and conservation. It includes a 'Frequently Asked Questions' section for the general reader and, for those wishing to find out more detailed information, a comprehensive reference list.

No abstract

Feeding in the platypus (Ornithorhynchus anatinus) was investigated by identifying material found in the cheek pouches of animals trapped in nets in a study area on the upper Shoalhaven River, N.S.W. Benthic samples were taken in the rapids and pools of the river and the relative abundance of food items available was related to the food found in the platypus cheek pouches. The main food organisms found were insect larvae, notably Trichoptera, Diptera, Coleoptera, Ephemeroptera and Odonata. Subsidiary food items found included freshwater shrimp (Paratya australiensis), bivalve mollusks (Sphaerium sp.) and one anuran. The main food items were generally taken in direct proportion to their numerical abundance in the river. Comparisons are made with the food selected by the brown trout (Salmotrutta) from the area. Estimates are made of the weights of invertebrate food necessary to maintain a platypus in various seasonal conditions.

The platypus Ornithorhynchus anatinus is an endemic monotreme species with a wide latitudinal distribution in eastern Australia, including Tasmania. Understanding of the phylogeography within this species is very limited at present and represents a gap in the documentation of Australia's unique biodiversity. We analysed mitochondrial DNA sequences (partial control region and complete cytochrome b, including portions of flanking tRNAs) of 74 individuals from across the distribution of the species. Phylogenetic analysis of the concatenated sequences corroborated the primary split within the platypus, showing two major clades: one from mainland Australia and the other from Tasmania/King Island. Estimates of divergence times suggest that these clades last shared a common mitochondrial ancestor~0.7-0.94 Ma. Using an extended dataset of partial control region sequences from 284 individuals, we found evidence of genetic structure between river basins, primarily within mainland Australia, as well as an additional divergent lineage in North-eastern Australia. Overall, few haplotypes were shared between river basins. Analyses of molecular variance of the control region sequences indicated low rates of gene flow and significant divergence, particularly at the river basin and geographical area scales.