Millions of giant prehistoric creatures migrate across deserts, forests and rivers, then cross a canyon, epic aerial photography

Prompt

Ultra-realistic prehistoric epic, 30 seconds, 16:9.
Millions of enormous creatures migrate across a continent.
0–8s: aerial shots reveal vast herds moving across deserts, forests and rivers.
8–15s: camera races among gigantic animals as dust clouds fill the horizon.
15–22s: the migration reaches a canyon. Thousands leap, climb and cross simultaneously.
22–30s: massive pullback reveals the migration stretching beyond the horizon in every direction, like a living river crossing the world.
Photorealistic wildlife documentary realism, gigantic scale, natural spectacle, cinematic aerial photography, no fantasy elements, no text.