The documentary film “Zootopia”

Reddit, they can crawl through all the animal emotion they might want over there.

Shush. Why must you rain on their parade, when there’s venture capital to be gained! /s

CatGPT

So then less empathic people might derive some use from the research.

AFAIK only on a fairly small amount of animals and with limited accuracy/consistency

Hungry, they are usually feeling hungry.

I have a pet pig. Please come demonstrate.

You’re thinking of dogs, and to a lesser extent, cats. They evolved with us to be more communicative. For example, dogs have far more facial muscles and muscle types.