zoology, biodiversity的学生们或讲师们快进来！有关动物的询问！

~HeBe~_@

猴子和狐狸是什么类型动物？
草食、肉食还是杂食动物？

我希望只允许有关的zoology, biodiversity的学生们或讲师们prof或有关的专家发表意见，
并附上论文证明猴子和狐狸是属于什么类型动物，因为我发觉到动物也开始进化当中了！
以前我们所知道的知识，可能不能再使用了。

谢谢。
P/s:别随意发表看法，你们得附上论文来确实它们。

XENgK

提出论文？有点过分要求啊。

简单带过
猴子和狐狸都是杂食动物。
因为猴子和狐狸同时拥有犬牙和臼齿，这两种牙齿都有独特的功能。

http://www.earthlife.net/mammals/teeth.html

Canines = Stabbing teeth - normally only 2 pairs (one each side) per jaw. They have a sharp, pointed edge and are used with the incisors to bite into food and or to kill prey. Like incisors they have one root. The tusks of many animals such as elephants are modified canines. They are missing in rodents and most large herbivores (Perissodactyls and Artiodactyls). The gap where the canines would have been is often enlarged and is called a 'diastema'.

犬牙适合撕裂肉类

Premolars = Next back from the canines. They are generally similar to molars in form and function in both herbivores and omnivores, but in carnivores some of them at least are slimmer and are used to cut flesh. When they (the first lower premolar and last upper premolar) are modified like this they are called the carnassials. Otherwise premolars are teeth we use to crush and grind our food. Their upper surfaces have a broad, lumpy top instead of a sharp biting edge. These small irregular lumps are called cusps. Premolars are called bicuspids in some books, this is because, in most cases, they have two cusps. The prefix bi meaning two. The first upper premolars normally have two roots. The other premolars have one root.

Molars = These are larger than premolars and extremely variable depending on the animal's diet. Like premolars they are used for crushing and grinding food, and like premolars their upper surfaces have ridges called cusps on them. Molars normally have three to five cusps and two or three roots. In humans we call the third molars, those closest to the back of the mouth 'Wisdom Teeth'. If the jaw bone is not large enough to accommodate all the teeth in it, as sometimes happens with humans, these wisdom teeth can become painfully wedged between the back of the jaw bone and the 2nd molars. This condition is known as 'impacted wisdom teeth'.

臼齿适合磨纤维类食物。



猴子牙齿


狐狸牙齿

~HeBe~_@

谢谢你的回复，让我获益不浅。
哈哈！论文有点严重了~不过，我们是不是以牙齿来做标准？还是要看看动物的肚子是否能消化肉或菜？

XENgK

我们是不是以牙齿来做标准？还是要看看动物的肚子是否能消化肉或菜？
~HeBe~_@ 发表于 26-5-2010 07:43 PM

需要看各种资料。
牙齿不过是消化系统的一部分，还要看肠胃。
那动物的 habitat 也有一定的影响。
世上有一种专吃螃蟹的狐狸。
有一种喝鲜血的小鸟哦。