1.
(of bird feet) having the first and second toes directed backward the third and fourth forward.
（指鸟类的脚）第一和第二个脚趾向后而第三、第四个脚趾向前。
2.
(of bird feet) having the first and fourth toes directed backward the second and third forward.
（指鸟类的脚）第一和第四个脚趾向后而第二、第三个脚趾向前。
3.
A bird whose feet are adapted for perching.
栖木鸟类脚爪适于栖息的鸟类
4.
(esp in birds)foot with claws
（尤指鸟类）带爪的脚
5.
swift-footed terrestrial plover-like bird of southern Asia and Africa.
亚洲南部和非洲腿脚敏捷的类鸻陆地生鸟。
6.
chiefly web-footed swimming birds.
主要是脚有蹼的游水鸟。
7.
birds having zygodactyl feet (except for the touracos).
对趾脚的鸟，蕉鹃除外。
8.
One, such as an ornithologist, who works with birds.
鸟类学家研究鸟类的人，如鸟学家
9.
small sandpiper-like shorebird having lobate toes and being good swimmers; breed in the arctic and winter in the tropics.
类似矶鹞的滨鸟，脚趾呈叶子形，是游泳好手；北极繁殖，热带过冬。
10.
A similar anatomical part, such as the fleshy rounded base of the human palm or the hind toe of a bird.
踵状物一个类似的组织部分，如人类手掌的圆形回基部分或者鸟类的后脚趾部分
11.
large aquatic birds: loons and some extinct forms.
大型水生鸟类；潜鸟及其它一些已绝迹的鸟类。
12.
Any of various similar New World birds of the family Icteridae.
类似拟穷琼鸟科的西半球的鸟类
13.
Any of several other birds that resemble the pheasant, such as the partridge.
雉科鸟类似于雉的其它鸟类，如山鹑
14.
Studies of Bird Karyotypes X. Emberizinae 9 Species
鸟类核型研究——Ⅹ.?亚科9种鸟类的核型
15.
Reptilia and Aves of North America
北美的爬虫类和鸟类
16.
(of the feet of water birds) having three toes connected by a thin fold of skin.
（水鸟的脚）三个脚趾由一层薄薄的皮连接起来的。
17.
Any of various small, quaillike Old World birds of the family Turnicidae that lack a hind toe and are related to the crane and the bustard.
三趾鹑一种象鹌鹑的无后脚趾的三趾鹑科小体型东半球鸟类，与鹤和大鸨有一定的亲缘关系
18.
Any of several large, web-footed birds constituting the family Diomedeidae, chiefly of the oceans of the Southern Hemisphere, and having a hooked beak and long, narrow wings.
信天翁组成信天翁科的大型有脚蹼的鸟类，主要产于南半球海域，喙呈钩状，翅长而窄