Some rules are meant to be broken, even those in the animal kingdom You're probably familiar with many of the common categories scientists use for animals: warm-blooded or cold-blooded, nocturnal or diurnal. But what about the animals that don't fit in? Sharks cannot be classified as warm or cold-blooded--they are somewhere in-between. And Eurasian eagle owls don't hunt during the day or night. Instead, they swoop through...