{"fact":"Crows living in harsher climates, like those in Europe, have larger hippocampi (brain regions associated with memory) compared to their North American relatives.","context":"Interestingly, the addition of new data on parids and a reanalysis revealed a continental effect; European species have a significantly larger hippocampus than North American species.","source":"Nathan J Emery, Cognitive ornithology: the evolution of avian intelligence, 10.1098/rstb.2005.1736","index":367}