A general term for animals in the genus Dendrolagus, family Macropodidae, order Marsupialia, class Mammalia. Members of this genus Dendrolagus are distributed in Queensland, Australia, and New Guinea. There are nine species, including the black tree kangaroo D. ursinus in the northwest of New Guinea, and the red tree kangaroo D. matschiei in the northeast. Size varies by species, with head and body lengths ranging from 52 to 75 cm, and tail lengths ranging from 52 to 89 cm. The tail is long, thick, and densely haired, and is easily bent but cannot be wrapped around objects. The front and hind legs are almost the same size, with the front legs having five toes, but the hind legs lack the first toe and the second and third toes joined together. Each toe has a powerful, curved claw. The hind legs are also wide, and the soles have rough, cushion-like pads called plantaris. The hair on the neck and back stands on end from the shoulders to the top of the head. It lives in rainforest areas and mainly lives in trees, but can also move on the ground. It moves quickly in the trees, sometimes flying up to 9 meters to lower branches. It rests in the trees during the day and becomes active after sunset, feeding on leaves, buds, and fruit. The female has a pouch on her lower abdomen that opens at the front. The gestation period is 32 days, and she usually gives birth to a single calf. The calf is hairless and has its eyes closed. The calf is raised inside the pouch. Its lifespan is thought to be 10 to 15 years, but there are records of one being kept in captivity for 20 years. [Ryuji Nakazato] ©Kimura Shuji "> Main species of kangaroos [specimen illustration] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
哺乳(ほにゅう)綱有袋目カンガルー科キノボリカンガルー属に含まれる動物の総称。この属Dendrolagusの仲間はオーストラリアのクイーンズランド州とニューギニア島に分布する。ニューギニア島北西部のクロキノボリカンガルーD. ursinus、北東部のアカキノボリカンガルーD. matschieiなど9種に分類される。大きさは種により異なり、頭胴長52~75センチメートル、尾長52~89センチメートル。尾は長くて太く毛が密生し、よく曲がるが物に巻き付けることはできない。前足と後ろ足はほとんど同じ大きさで、前足は5本指であるが、後ろ足は第1指を欠き、第2、第3指が結合している。おのおのの指に曲がった強大なつめがある。また、後ろ足は幅広く、足裏には蹠球(しょきゅう)というざらざらしたクッションのような肉球がある。頸(くび)と背の毛は、肩から頭頂に向かい逆立って生える。 多雨林地帯に生息し、おもに樹上で生活するが、地上でも行動できる。樹上での行動はすばやく、ときには下方の枝に9メートルも飛ぶことがある。昼間は樹上で休息し、日没後に活動して、木の葉や芽、果実などを食べる。雌の下腹部には育児嚢(のう)があり、前方に開口する。妊娠期間は32日で、普通は1頭の子を産む。生まれた子は無毛で、目は閉じている。子は育児嚢内で育てられる。寿命は10年から15年と思われるが20年間飼育された記録がある。 [中里竜二] ©木村しゅうじ"> カンガルーのおもな種類〔標本画〕 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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