Conspicuous stripes on prey capture attention and reduce attacks by foraging jumping spiders.

Many animals avoid predation using aposematic displays that pair toxic/dangerous defences with conspicuous achromatic warning patterns, such as high-contrast stripes. To understand how these prey defences work, we need to understand the decision-making of visual predators. Here we gave two species of jumping spiders ( and ) choice tests using live termites that had their back patterns manipulated using paper capes (solid white, solid black, striped).

Giving and promising gifts: Experimental evidence on reciprocity from the field.

We test the value of unconditional non-monetary gifts as a way to improve health worker performance in a low income country health setting. We randomly assigned health workers to different gift treatments within a program that visited health workers, measured performance and encouraged them to provide high quality care for their patients. We show that unconditional non-monetary gifts improve performance by 20 percent over a six-week period, compared to the control group.

Comparative morphology of the mechanosensory lateral line system in a clade of New Zealand triplefin fishes.

The mechanoreceptive lateral line system in fishes detects hydrodynamic stimuli and plays a critical role in many fundamental behaviours, including orientation to water currents and the detection of stationary objects, prey and predators. Interspecific variation in lateral line structure may result from a process of functional adaptation, with the background level of hydrodynamic activity proposed as an important selective pressure. Here we use the eight species of the ecologically diverse New Zealand marine triplefin fish of the genus Forsterygion and one species from the sister genus Notoclinops to investigate interspecific differences in lateral line morphology and to assess the relationship between lateral line characteristics and exposure to wave energy (fetch/depth ratio).