Animals often respond fearfully when encountering eyes or eye-like shapes. Although gaze aversion has been documented in mammals when avoiding group-member conflict, the importance of eye coloration d
Many non-human primates have been observed to reciprocate and to understand reciprocity in one-to-one social exchanges. A recent study demonstrated that capuchin monkeys are sensitive to both third-pa
1. Parenting is costly and because the relationship between the mother and embryos is not mutualistic, mother-offspring conflicts may exist whenever resource are scarce. However, intergenerational tra
Original data from: Rodríguez-Gómez, G.B. & F.E. Fontúrbel. Regional-scale variation on Dromiciops gliroides occurrence, abundance, and activity patterns along a habitat disturbance gradient. Jour
