english: If we look at that region in mammals that don't see so well, such as bats, and we find that bats that don't see so well have the purple type, we know that this is probably what's causing this disease.
non_english: Ako posmatramo taj region  kod sisara koji ne vide tako dobro, kao što su slepi miševi, i pronađemo  da slepi miševi koji ne vide tako dobro imaju ljubičasti tip,  znaćemo da je to ono što uzrokuje bolest.