Subject 37

The subject that was under observation, Subject 37, is a male that was retrieved from a disabled spacecraft, and brought planet-side so that we might study his race.
The subject is warm-blooded, and although he has no natural defenses, is remarkably resilient when stimuli, such as pain, are introduced.
Language has proven quite a barrier; he has appeared to be attempting to communicate with us on several occasions, but always seems to resort to attempting to cause harm when no discourse can be established.
Subject 37 escaped yesterday, and, as humans are considered dangerously unstable, must be recaptured.