题目为〈〈保护动物〉〉的科学论文~240字左右,明天用啊,内容是怎样保护动物

Question

题目为〈〈保护动物〉〉的科学论文~
240字左右,明天用啊,内容是怎样保护动物

Answer 1

扬子鳄俗称土龙,是中国惟一的鳄种.仅产于长江下游一带,原来中国还有另外一种鳄即湾鳄,但早已灭绝,因此扬子鳄显得十分珍贵,已被列为一级保护动物.
扬子鳄体长2米左右,重30-40公斤,背部为暗褐色带有黄色斑及条纹,腹部为灰白色,并有黄色小斑和横条.尾部有灰黑相间的环纹,它的四肢粗短,在陆地上活动不是十分灵敏,水中游泳则十分敏捷,它的尾巴可作为攻击和自卫的武器.
扬子鳄是一种古老的爬行动物,经历了地质史上的冰川气候和造山运动等大变化而幸存下来,在地球上 活至少1亿年了.由于它的体型、构造和古代恐龙接近. 因此被称为恐龙的活化石.时代算起,已被认识有三千四五百年的历史.在20世纪50年代扬子鳄的数量还相当多,因被人们大量捕杀,再加上人口增多,占领了扬子鳄适宜的生存环境,导致扬子鳄迅速减少.目前扬子鳄数量已不足500只,只限于江苏、安徽的长江南岸.为了保护扬子鳄,中国已把它列入国家一级保护动物名单,并在安徽建立了扬子鳄繁殖研究中心,旨在使这种古老的生物永远地在地球上生存下去.
The 扬 son crocodile is so called the soil dragon, is only one crocodile in China to grow.BE produce in only once downstream in Yangtze River take, originally Chinese there is also moreover a kind of crocodile namely the gulf crocodile, but destroy completely already, so the 扬 son crocodile seem to be very precious, having already been list as one class protection animal.
The 扬 son crocodile body grows 2 meters or so, heavy 30-40 kilograms, the back takes the yellow spot and grain for the dark brown, the belly is a grey color, also yellow and small spot with horizontal.The coda has the ash black and alternate wreath 纹 , its arms and legs is thick short, the activity isn't very intelligent on the land, the swimming in water then is very nimble, its tail be the weapon of the attack and self-defense.
The 扬 son crocodile is a kind of ancient reptile, experiencing the glacier weather of the geology history with build the mountain sport to wait big variety but luckily survive down, at on the earth live 100,000,000 years at least.Because its type of figure,structure and ancient dinosaur near to. Therefore be called dinosaur of activate a stone.The ages rises on the whole, having already been know 3,400.The quantity of the 扬 son crocodile in 50's in 20 centuries still very many, because of being caught to kill in great quantities by people, and the population increase, capturing the 扬 son crocodile feat existence environment, causing the 扬 son crocodile reduce quickly.The 扬 son crocodile quantity isn't enough 500 already currently, south shore in Yangtze River that is limited by Jiangsu,Anhui.For the sake of the protection 扬 son crocodile, China has already been included in it national a class protection the animal list, and built up the 扬 son crocodile to breed the research center in Anhui, the aim was make this kind of ancient living creature forever Be existing on the earth under.