The spotted moray eel is solitary and feeds during the day.
She keeps her mouth open but closes it occasionally, possibly to get the water through her gills and improve her oxygen supply.
Mammals have a horizontal tail.
Fishes have a vertical fin.
The tiger shark has slender marks similars to the lines of tigers, hence its name.
When it is juvenile, these marks are round and not vertical. They change when it grows.
The whale shark is the largest fish in the world!
Some whales are larger, but they are mammals, not fish!