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The more I learn about ducks, the more impressed I am with their blatant promiscuity. Mallards, of course, bring new meaning to the term dabbling duck, what with all those wild mallard hybrids and domestic cross-breeds running around. But apparently, all the Anas-species ducks are overly amorous or at least indiscriminate. Consider the teals. Teal [...]

The taxonomic practice of speciation must be more art than science. After all, there are at least six distinct and recognizable populations of Dark-eyed Junco (Junco hyemalis) yet different species of scaup or Empidonax flycatcher are practically indistinguishable without resorting to DNA testing. Most higher animals are separated biologically, by the likelihood of gene flow [...]