Despite the odds, there are countless stories of the most unlikely cross-species relationships imaginable: a goat guiding a blind horse; a doe who regularly visits her Great Dane surrogate mother; a juvenile gibbon choosing to live with a family of capuchins, and so on. Instincts gone awry? The subject has mystified scientists for years. Now, NATURE investigates why animals form these special bonds. Informed by the observations of caregivers and noted scientists Temple Grandin and Marc Bekoff, the film explores what these relationships suggest about the nature of animal emotions.