Proof of what we always suspected: Who you calling ugly? Zoos prefer cute animals to less attractive species, research shows . "Selection of species into world zoos is determined by decisions made by humans, and intelligent and beautiful animals seem to be favoured," the researchers say. More than seven million animals are kept in 872 zoos and aquariums worldwide. Zoologists from Prague's Charles University investigated the range of mammals kept and which were left out. Out of 5,334 mammalian species, only 1,048 of them, or 16 per cent, were found in the world zoo collection. The team used data on brain size and attractiveness to humans to see why some species were being left out in the cold. But!…