▁ 1 8 9 ▁known ▁sn outer ▁species ▁desc ended ▁from ▁a ▁small ▁sh rew - like ▁animal , ▁which ▁gradually ▁evol ved ▁and ▁divers ified ▁to ▁fill ▁most ▁of ▁the ▁e colog ical ▁nich es ▁in ▁the ▁arch ip el ago ▁— ▁from ▁tiny ▁w orm - like ▁be ings ▁to ▁large ▁her b iv ores ▁and ▁pred ators . ▁ ▁Many ▁r hin og r ades ▁used ▁their ▁nose ▁for ▁lo com otion , ▁for ▁example ▁the ▁" sn out ▁le apers " ▁like ▁H ops orr hin us ▁a ure us , ▁whose ▁nas or ium ▁was ▁used ▁for ▁jump ing , ▁or ▁the ▁" ear w ings " ▁like ▁O top tery x , ▁which ▁fle w ▁backwards ▁by ▁fla pping ▁its ▁ears ▁and ▁used ▁its ▁nose ▁as ▁a ▁rud der . ▁Some ▁species ▁used ▁their ▁nas or ium ▁for ▁catch ing ▁food , ▁for ▁example ▁by ▁using ▁it ▁to ▁fish ▁or ▁to ▁attract ▁and ▁trap ▁insect s . ▁Other ▁species ▁included ▁the ▁fier ce ▁Ty ran non as us ▁imper ator ▁and ▁the ▁sh ag gy ▁M amm ont ops . ▁ ▁Pet ter sson - Sk ä mt kv ist ' s ▁early ▁descri ptions ▁of ▁the ▁animals ▁he ▁encountered ▁on ▁Hy - yi - yi ▁led ▁zo olog ists ▁to ▁name ▁them ▁after ▁the ▁title ▁creature ▁in ▁a ▁short ▁n ons ense ▁poem ▁by ▁Christian ▁M orgen st ern , ▁The ▁Nas ob ame ▁( D as ▁Nas ob ē m ). ▁In ▁the ▁poem ,