No. Almost all animals can swim, but not all. Most animals actually like it and are pretty good at it. Some though, such as some land insect simply do not have bodies that allow them to swim. You can find more information here: http://www.animals-zone.com/can-all-anim...

Let us just say they all have the capability to swim. All of them may make it a couple of feet or so but, not all of them can cross the Rio Grand.