Figure 1.

Lifespan dimorphism (ln(homogametic lifespan/heterogametic lifespan)) across all species analysed in our data. Phylogeny of species included to organize the species into categories including (from top to bottom): primates and Homo sapiens, Rodentia (rodents), pinnipeds (seals), carnivorous mammals, e.g. Panthera leo, ungulates (hoofed mammals), cetaceans (whales and dolphins), marsupial mammals, Aves (birds), reptiles and amphibians, Fish (both Chondrichthyes and Actinopterygii), beetles, Diptera (flies and mosquitoes), Lepidoptera (butterflies and moths) and other invertebrates. (Online version in colour.)