Baja California, Mexico A new species of giant spider discovered by researchers from the San Diego Natural History Museum, together with colleagues from Mexico and Brazil, named Califorctenus cacachilensis, is displayed at the Centre for Biological Research of the North-east. The spider’s legs are approximately 10cm long, and it was first sighted in 2013 in a mountainous area on the outskirts of La Paz

Photograph: Ricardo Valenzuela/AFP/Getty Images