Those other first animals tended to their young, as do most of their descendants, such as birds, reptiles, and mammals, which still bring their young food and fight to protect them.

从第一只动物到其逐渐进化而成的后裔，如鸟、爬行动物和哺乳动物，都把抚养后代视为头等大事，它们为年轻的下一代殚心竭虑，关怀备至，操碎了心；

youdao

There would be a big group of people; one would go to lunch, then go to the beach, have dinner afterwards, and from everyone possible, young, old, even animals - he would somehow get their energy.

他需要一大群人；一个一起吃午饭，然后去海滩，之后吃晚饭，他几乎能从所有人那里以某种方式获得力量，年轻的，年老的，甚至动物。

youdao

That is why, they believe, most animals — mammals, birds, reptiles, amphibians and fish — produce their young and multiply in spring.

他们也由此认定，大多数动物——哺乳动物，鸟类，爬行动物，两栖动物和鱼类——在春天生育繁殖。因为春季白天开始变长，气温也日渐回升。

youdao

It showed polar bear cubs in a den with their mother, with many people assuming the young animals were born and filmed in the Arctic.

BBC: Sir David Attenborough