Museums have a gender equality problem. Wander the halls of any natural history gallery and chances are, you’ll see more male than female specimens on display.
Researchers at London’s Natural History Museum analysed 2.5 million records from five prominent museums around the world and found that just 40 per cent of bird specimens are female, while 48 per cent of mammal specimens are female. This slight percentage difference equates to 40,000 more male mammals housed in museums.
It’s not just an issue for the stuffed display animals, either—the male bent also afflicts research collections. When it comes to type specimens—the ‘official’ specimen used to scientifically describe a species—the sex ratio drops further, with just 27 per cent of birds and 39 per cent of mammals being female.
These ratios have remained unchanged for the last 130 years, except in species with marked sexual dimorphism. This is where males have ostentatious features such as bright colours while females may be more understated in appearance. In such species, the proportion of females in museum collections has decreased.
This bias towards males has implications for our understanding of evolution, genetics and ecology.
“Natural history collections play a critical role in … answering vital questions for the future of biodiversity,” the study authors wrote. “These results imply that previous studies may be impacted by undetected male bias, and vigilance is required when using specimen data, collecting new specimens and designating types.”