How is an animal feeling at a given moment? Humans have long recognised certain well-known behaviour like a cat hissing as a warning, but in many cases we’ve had little clue of what’s going on inside an animal’s head.

Now we have a better idea, thanks to a Milan-based researcher who has developed an AI model that he claims can detect whether their calls express positive or negative emotions. Stavros Ntalampiras’s deep-learning model, which was published in Scientific Reports, can recognise emotional tones across seven species of hoofed animals, including pigs, goats and cows. The model picks up on shared features of their calls, such as pitch, frequency range and tonal quality.

Read Insight’s Dr Shelley Brady in The Conversation