frilled lizard

Japanese: エリマキトカゲ - えりまきとかげ(英語表記)frilled lizard
frilled lizard

A lizard of the Agamidae family in the Squamata order of the Reptilia class. It is found in northern Australia and southeastern New Guinea, inhabiting lowland forests. Its total length is 75-90 cm, with the tail taking up about two-thirds of that. It has a large, scarf-like frill on its neck, supported by a cartilage support formed by an elongated hyoid bone. It usually hangs down from its shoulders, but when excited it spreads it like a parasol, reaching a diameter of 20-30 cm. The frill has the effect of making the body appear larger, and it spreads it when threatening an enemy or courting, but it is also thought that its large skin area acts as a radiator to regulate body temperature. It is arboreal, but descends to the ground after rainfall to hunt for insects, including large numbers of ants. When startled, it runs a considerable distance on its hind legs alone, escaping to the safety of a tree.

[Takahiro Matsui]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

爬虫(はちゅう)綱有鱗(ゆうりん)目アガマ科のトカゲ。オーストラリア北部、ニューギニア島南東部に分布し、低地の森林地帯に生息する。全長75~90センチメートル、尾はその3分の2ほどを占める。頸部(けいぶ)には、舌骨が長く伸びてできた軟骨の支柱に支えられた、大きな襟巻状のひだ飾りがある。普段は肩に垂れているが、興奮するとパラソルのように広げ、直径20~30センチメートルにも達する。襟飾りは体を大きくみせる効果があり、敵に対する威嚇や求愛行動のときに広げるが、広い皮膚面積が体温調節のラジエーター(放熱器)の役割を果たすものとも考えられている。樹上性であるが、降雨のあとなど地上に降りて、大量のアリを含む昆虫類を求める。驚くと後肢だけでかなり長距離を走り、安全な樹上に逃げる。

[松井孝爾]

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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