Unifying behavioral analysis through animal foundation models

Although there is the saying, "straight from the horse's mouth," it's impossible to get a horse to tell you if it's in pain or experiencing joy. Yet, its body will express the answer in its movements. To a trained eye, pain will manifest as a change in gait, or in the case of joy, the facial expressions of the animal could change. But what if we can automate this with AI? And what about AI models for cows, dogs, cats, or even mice?