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.
Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.rilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.