How did the documentary about ancient times, extinct birds and animals, come out? Is it made by computer?

Let me talk about the background first: it is divided into three types: studio, real scene and computer production.

For example, animals and birds make models before shooting, or install sensors on the models before shooting, and finally synthesize them by computer.

I suggest you look for relevant BBC movies and look at the shooting tidbits of Jurassic Park.