A cow backflipping on a trampoline

Build a single self-contained HTML file with a 3D scene made in Three.js (you may load Three.js from a CDN).

The scene: A cow doing a backflip on a trampoline.

Rules:
- The animation starts on its own and loops forever. No interaction, no controls, no buttons.
- No text, labels or UI on screen.
- The scene fills the whole browser window and is framed for a square viewport, with the subject clearly visible in the middle.
- Everything is built in code. No external images, models or textures.

Paste it into any model and see what you get.