Ingrid Veninger (El Mundo O Nada) asks the first question directly in the introduction to her eight feature Crocodile Eyes.

The tail provides the main thrust for the crocodile while it swims. Watch a croc swim and you'll see that it seems to make an S shape as it glides through the water. This makes the most efficient ...

Capybaras’ eyes, ears, and nostrils are higher ... it’s no surprise capybaras instinctively run for the water. It’s hard to understand why crocodiles exhibit such a deviation in behavior.