Being parasitised by a greater honeyguide is very bad news for a host – the young honeyguide stabs the host’s young to death with special bill hooks as soon as it hatches (more here). It’s therefore puzzling that little bee-eater hosts seem not to recognise and eject honeyguide eggs from their nests (more here). In this paper, we tested whether perhaps the sight of a female honeyguide (pictured) at the nest might give hosts a cue that they’re being parasitised and prompt them to defend themselves. The answer is that most bee-eaters seem bafflingly blithe! Read more in the original paper by Wenfei Tong, Nicholas Horrocks and Claire Spottiswoode, available open access in Ibis.
Our paper ‘Why and how to apply Weber’s Law to coevolution and mimicry’ has been published in the journal Evolution. This perspectives paper, written by Tanmay Dixit, Eleanor Caves, Claire Spottiswoode, and Nicholas Horrocks, argues that Weber’s Law of proportional processing can lead to otherwise counterintuitive predictions about the evolutionary trajectories of mimicry systems. Weber’s Law states that when the magnitude of a stimulus is large, it is more difficult to discriminate a change or difference from that stimulus. In other words, relative differences are more salient than absolute differences. We show that Weber’s Law could have implications for mimicry: when stimulus magnitudes are high, it should be more difficult to discriminate a model from a mimic. This leads to testable predictions about evolutionary trajectories of models and mimics. We also present a framework for testing Weber’s Law and its implications for coevolution.