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copperhead

(Encyclopedia) copperhead, poisonous snake, Ancistrodon contortrix, of the E United States. Like its close relative, the water moccasin, the copperhead is a member of the pit viper family and detects…

mantis shrimp

(Encyclopedia) mantis shrimp, marine crustacean of the order Stomatopoda, characterized by a pair of enlarged appendages, called maxillipeds, that form powerful claws for seizing prey. The last two…

Chaetognatha

(Encyclopedia) CE5 Anatomy of an arrow worm, Sagitta, representative of the phylum Chaetognatha ChaetognathaChaetognathakētôgnăthˈə [key], phylum of predominantly pelagic marine animals commonly…

Celestine V, Saint

(Encyclopedia) Celestine V, Saint, 1215–96, pope (elected July 5, resigned Dec. 13, 1294), an Italian (b. Isernia) named Pietro del Murrone; successor of Nicholas IV. Celestine's election ended a two…

angler

(Encyclopedia) angler or anglerfish, common name for a member of the order Lophiiformes, predacious fishes found worldwide; many are deep-sea dwellers. Anglers lure their prey with a long, wormlike…

darter, bird

(Encyclopedia) darter or anhingadarterănhĭngˈgə [key], common name for a very slender, black water bird very closely related to the cormorant. It frequents the wooded borders of freshwater lakes,…

monitor, in zoology

(Encyclopedia) monitor, any of various, mostly tropical lizards. A monitor lizard has a heavy body, long head and neck, long tail that comes to a whiplike end, and strong legs with sharp claws. Its…

water moccasin

(Encyclopedia) water moccasin or cottonmouth, highly venomous snake, Ancistrodon piscivorus, of the swamps and bayous of the S United States. Like the closely related copperhead, it is a pit viper…

Tinbergen, Nikolaas

(Encyclopedia) Tinbergen, Nikolaas, 1907–88, Anglo-Dutch zoologist, b. Netherlands. He received his Ph.D. in 1932 from the Univ. of Leiden, where he became professor of zoology in 1947. In 1949 he…

pelican

(Encyclopedia) pelican, common name for a large, gregarious aquatic bird of warm regions, allied to the cormorants and gannets. Pelicans are heavy-bodied, long-necked birds with large, flat bills.…