The head is narrow, flat, triangular and relatively small compared to the rest of the body. He also states that: "in case of the horned puff-adder, the young when born are a foot long" (~30 cm), which is 20 to 65 percent longer than the average birth length given by Spawls et al. gabonica (gaboon viper) grow to "between four and five feet" (about 120 to 150 cm) in Liberia. Explorer Harry Johnston (1858 – 1927) mentions in his book 'Liberia' (1906) that adult "puff-adders" of the species B. (2004) mentioned a maximum total length of 120 cm (47 in), but admitted this is exceptional, quoting an average total length of 60–90 cm (about 24–35 inches). Large and stout, it ranges in total length (body + tail) from 72 to 107 cm (about 28 to 42 inches). Interestingly the dutch name for Bitis nasicornis is "rhinoceros puff adder" ( Dutch: neushoornpofadder), while Bitis caudalis (horned adder) is named "horned puff adder" ( Dutch: gehoornde pofadder). The name "horned puff adder" (in relation to the viper subfamily "puff adders", today synonumous with the genus Bitis) is also a historical name for Bitis caudalis ( horned adder) and can cause confusion. The common name butterfly viper is therefore more distinct and preferred to avoid confusion. Historically this species was referred to as the rhinoceros viper (for example German: Nashornviper, French: Vipère rhinocéros) but this introduced confusion after the reclassification of the closely related species Bitis rhinoceros. Americo-Liberians apparently call adult "puff-adders", such as the B. Its common and historical names include butterfly viper, rhinoceros viper, river jack, rhinoceros horned viper, horned puff adder and rhinoceros puff adder. Its common names include butterfly viper, rhinoceros viper, river jack and many more (see section: common names). This large viper is known for its striking coloration and prominent nasal "horns". Duméril, 1854īitis nasicornis is a viper species belonging to the genus Bitis, part of a subfamily known as "puff-adders", found in the forests of West and Central Africa.
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