Not sure how to compare intelligence across species (one idea is length of focus time?), but it would be interesting to make a chart with crows, hornbills, peop

Not sure how to compare intelligence across species (one idea is length of focus time?), but it would be interesting to make a chart with crows, hornbills, people, and dolphins. The hornbill is the most aware animal that I've seen in zoos - they actively watch the visitors, even beyond their enclosures. This is the first time I've seen somebody domesticate them: https://www.quora.com/What-are-your-thoughts-on-the-hornbill https://www.quora.com/What-are-your-thoughts-on-the-hornbill