Jackson's chameleon

Japanese: ジャクソンカメレオン - じゃくそんかめれおん(英語表記)Jackson's chameleon
Jackson's chameleon
A lizard of the Chamaeleonidae family in the reptile class (illustration), in which males have three horn-like protrusions. It is about 30 cm long, and its tail is just over half that length. It is found in the highlands of Kenya and Tanzania in East Africa. It lives in trees and preys mainly on insects. Only males have horn-like protrusions; females lack them, making them look like a different species. The horns are bony and covered with a horny sheath; they are modified parts of the skull, with two protruding between the eyes and one protruding from the tip of the snout. Males use the horns in territorial disputes and in fights with intruders, but they also serve to blur the outline of the head and deflect attacks from enemies.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
雄が3本の角状突起をもつ爬虫綱カメレオン科のトカゲ(イラスト)。全長約30cm。尾はその1/2強である。東アフリカのケニア・タンザニア地方の高地に分布する。樹上にすみ,おもに昆虫類を捕食する。角状突起をもつのは雄のみで雌はこれを欠き,あたかも別種のように見える。〈角〉は角質の鞘に覆われた骨質で,頭骨の一部が変形したものであり,両眼の間に2本,吻端(ふんたん)に1本が突き出ている。〈角〉は雄のなわばり争いや侵入者との戦いに用いるが,また頭部の輪郭をぼかして,敵の攻撃をそらせる役割をも果たしている。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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