Teeth have been replaced by beaks... 牙齿被喙取代 ...that allow them to feed on new diets. 使其能够以新的食物为食 But advances in feeding and flight alone 但仅靠进食与飞行上的进步 were not enough to ensure the future of the birds. 并不足以确保鸟类有一个光明的未来 They also drew on a r...
But advances in feeding and flight alone 但仅靠进食与飞行上的进步 were not enough to ensure the future of the birds. 并不足以确保鸟类有一个光明的未来 They also drew on a rather flamboyant ancient behavior, 它们还依赖于 一种相当引人注目的古老行为 a behavior that ensures the survival of t...
...that allow them to feed on new diets. 使其能够以新的食物为食 But advances in feeding and flight alone 但仅靠进食与飞行上的进步 were not enough to ensure the future of the birds. 并不足以确保鸟类有一个光明的未来 They also drew on a rather flamboyant ancient behavior, 它们还依赖于 一种...
have become specialized for aerial mastery. 如今已变成驾驭天空的专用工具 And that's not the only change. 这还不只是唯一的变化 Teeth have been replaced by beaks... 牙齿被喙取代 ...that allow them to feed on new diets. 使其能够以新的食物为食 But advances in feeding and flight al...
And that's not the only change. 这还不只是唯一的变化 Teeth have been replaced by beaks... 牙齿被喙取代 ...that allow them to feed on new diets. 使其能够以新的食物为食 But advances in feeding and flight alone 但仅靠进食与飞行上的进步 were not enough to ensure the future of th...
Feathers, that first evolved to keep dinosaurs warm, 羽毛最初进化是为帮助恐龙保暖 have become specialized for aerial mastery. 如今已变成驾驭天空的专用工具 And that's not the only change. 这还不只是唯一的变化 Teeth have been replaced by beaks... 牙齿被喙取代 ...that allow them to ...
and it allows flamingos to travel in search of food... 令火烈鸟能够飞行以寻找食物 just as birds did millions of years ago. 就像数百万年前的鸟类那样 Feathers, that first evolved to keep dinosaurs warm, 羽毛最初进化是为帮助恐龙保暖 have become specialized for aerial mastery. 如今已变成...
just as birds did millions of years ago. 就像数百万年前的鸟类那样 Feathers, that first evolved to keep dinosaurs warm, 羽毛最初进化是为帮助恐龙保暖 have become specialized for aerial mastery. 如今已变成驾驭天空的专用工具 And that's not the only change. 这还不只是唯一的变化 Teeth have b...
This is powered flight, 这是有动力飞行 and it allows flamingos to travel in search of food... 令火烈鸟能够飞行以寻找食物 just as birds did millions of years ago. 就像数百万年前的鸟类那样 Feathers, that first evolved to keep dinosaurs warm, 羽毛最初进化是为帮助恐龙保暖 have become speci...
Wings that have been modified to flap. 翅膀变得能够挥动 This is powered flight, 这是有动力飞行 and it allows flamingos to travel in search of food... 令火烈鸟能够飞行以寻找食物 just as birds did millions of years ago. 就像数百万年前的鸟类那样 Feathers, that first evolved to keep ...