Plenty of poets wrote them, but the most famous of all is John Milton's  Lycidas . Like all typical pastoral elegies, Milton mourns the loss of his best bud (who died in a shipwreck). But he also compares him to a shepherd and describes the ways in which nature mourns his loss, too.
The Banff longnose dace, a small minnow, was recently declared extinct. It failed to compete with the guppies, swordtails, sailfin mollies and other tropical fish that had been released in the warm marsh below the famous hot springs by tourists and national park officials.
There is a different species of louse for each species of animal. While dog lice are uncommon, Linognathus piliferus is the species most often found. The entire lifespan of a louse is lived on 1 host. Dog lice will not live on humans; nor will human lice live on dogs. Dog lice mate on the dog and attach their nits to the hairs of the dog. They hang on for life, for within hours they will die if not on the body of a host.