Halas
An halas o dupóng (Iningles: snake) usa ka reptilya han orden Squamata ngan ubos-orden Serpentes.
An sawa ngan ibingan amo an mga halimbawa san halas na agsub maiimdan ha Samar.
Ebolusyon
An fossil na makikilala na kanan halas una na nabuhi sadton Cretaceous period. An giaagapi na fossil san halas nagtikang sa Utah ngan Algeria, na nagrepresentar sa genera Coniophis ngan Lapparentophis. Inin mga lugar na gintikangan sini na mga fossil nagkakaedad sadton Albian ug Cenomanian san panahon sa kaurhian san Cretaceous, haros 112 tubtob 94 milyones katuig an nakalabay. Sugad man, an sayo nga lugar sa Algeria nagkakaedad sin sin 125 tubtob 112 milyones katuig an nakalabay.
Distribusyon
May'ada lahos sa 2,900 na specie san halas na mahihiagiaan tikang ha Arctic Circle ha Scandinavia ha norte tubtob timog ha Australia. Mahihiagian an halas sa natanan na kontinente maliban ha Antarctica. Mahihiagian liwat ini sa kadagatan, ngan sa higtaas na lugar sugad san Himalayan Mountains ha Asya.:143 Daramo na puro na kun diin wara halas, sugad san Ireland, Iceland, ngan New Zealand (kudi an dagat sa libot san New Zealand pirmi ginbibisita san yellow-bellied sea snake ngan san banded sea krait).
Pinanbasaran
Mga sumpay ha gawas
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| Wikisource has the text of the 1920 Encyclopedia Americana article Serpents. |
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