Anytime you have a case about a possible ET entity, you have to be careful; the facts can be spun to a point you don't know what to believe.
However, one case that has well stood the test of time is the alleged 1996 capture of two such entities in Brazil. As I mention in the article, I have covered this case before. See 1996 - Brazilian Alien Entity.

Only recently I received another report on the case that does have some additional details.

You've probably read about this case before, but you may see some additional details. Be sure to check out 1996 - Two Alien Creatures Captured in Brazil, and let us know what you think.