Nutria (Spanish name in Costa Rica))

I agree, most definitely an otter.

Puedo entenderte claramente, gracias nuevamente por su comentario.
Las Otters (nutrias) son aun comunes en nuestros rios....Son animales que disfruto mucho poder ver.
I understand , thanks again for your comment.
The Otters (nutrias) are still common in our rivers .... They are animals that I enjoyed much seen.

Ah, el problema con los nombres comunes. Perdona mi implicación que no son correctos. Traducción puede ser incorrecta, ya que estoy usando Google Translate para traducir del Inglés al Español.

Ah, the problem with common names. Forgive my implication that you were incorrect. Translation may be incorrect as I'm using Google Translate to translate from English to Spanish.

Gracias estoy usando el nombre común en mi pais.....

That's definitely an otter, a nutria is what you folks sometimes call a Coypu

I think you may have the scientific name correct, but the common name is "Neotropical River Otter" not nutria, which is a different animal. Great photos of a rare animal!