A western pygmy marmoset at an enclosure in the city’s zoo in Ústí nad Labem, Czech Republic on August 5, 2025. The pygmy marmoset (Callithrix pygmaea), which is found in the north-western Amazon rainforest, is the world’s smallest higher primate and can leap as far as 5 metres. (Photo by Slávek Růta/ZUMA Press Wire/Rex Features/Shutterstock)
