glacier flea come out after hibernation

hibernation northern latitudes winter insects attacked accumulate multitude glacier flea isotoma saltans hopper flech bug collembola achorutes nivicola snow springtail armored podura collembolan reproduction insect arthropods animal april bagdarin biology buryatia fauna fleas crawl frost glacial ice cover lake melting natural phenomenon naturalist nature watching europe preconnubia rasputin spring springtime thaw warming wild wildlife zoology connubial