Revisiting Weir et al. 2002

In a study published in Science in 2002, Alex Weir, Jackie Chappell and Alex Kacelnik demonstrated that New Caledonian crows can bend wires into the shape of hooks to access food. This study was probably the first report of an animal purposefully modifying an object to use as a tool. Fifteen years after the paper … Continue reading Revisiting Weir et al. 2002

Revisiting Hill 1991

In 1991, Geoffrey Hill published a paper in Nature describing the results of his field experiments with house finches which showed that: 1. females choose to mate with brightly-coloured males; 2. males with brightly-coloured plumages tended to contribute more to parental care and were also likely to be of better "genotypic quality". Twenty-five years after … Continue reading Revisiting Hill 1991

Revisiting Milinski and Bakker 1990

In 1990, Manfred Milinski and Theo Bakker published a paper in Nature providing experimental evidence in support of the Hamilton-Zuk hypothesis. Milinski and Bakker showed, through experiments on three-spined stickleback, that: 1. the intensity of a male's red color is correlated with his physical condition; 2. females choose males based on red color intensity; 3. … Continue reading Revisiting Milinski and Bakker 1990

Revisiting Clutton-Brock and Harvey 1977

In 1977, Tim Clutton-Brock and Paul Harvey published a paper in the Journal of Zoology reporting the results of their comparative analysis of the ecology and social organization of 100 primate species. This study was probably the first to statistically account for the non-independence of data as a result of species' phylogenetic relationships, a theme … Continue reading Revisiting Clutton-Brock and Harvey 1977

Revisiting Seehausen et al. 1997

In 1997, Ole Seehausen, Jacques van Alphen and Frans Witte published a paper in Science¬†providing evidence for a novel route through which eutrophication can reduce species diversity. Species of cichlid fish in Lake Victoria are capable of interbreeding, but mate choice based on coloration and subsequent assortative mating keeps species distinct. Seehausen and colleagues found … Continue reading Revisiting Seehausen et al. 1997