MAGELL
Known to be a very peaceful race.
They have 2 permanent bases somewhere in South America.
They are 100% nocturnal, do not interact with Humans and are described by other alien races as "shy".
They harvest insects and rodents by the many thousands on a monthly basis...reason: unknown.
At least 3 of them have been under Brasilian military custody for the past 12 years.
Last sighting: near Oaxaca, Mexico, in 2003
They are visited by their own kind (race) every 20 years...the next visit should be around 2016.