This is of course a really bad requirement. A lot of people in the world do not know English, and would thus be unable to let anyone know that they will mutually honor some sort of Interspecies Protective Treaty. Mostly, they would be unable to read any such treaty, or reply with the word "yes".

First create a requirement that all human being will pass. Then see if cetaceans do pass it.

The recently and soon to be extinct species would disagree with you.

Also, if homo sapiens had the same levels of "protection" I'd be able to cull yuppies when too many of them moved into my neighborhood.