29 April 2018 ca.12:25 A.M. Apartments at Hunter Rd. and Wonder World, San Marcos, TX. I exited my vehicle after returning from work, noticed a slight movement in the moonlight. Looked up and saw an ephemeral shadow, or a reflection of a shadow would be a better description. It was blending 'almost' perfectly out of the moonlight into the darker regions of the sky. It seemed to be about 40 - 60 feet above me at a slight angle, its size was at least 40 feet in length. It moved very slow, but too slow for a bird gliding. It was chevron/boomerang shaped. It was gray, but it was easier seen if I looked at it upon the peripheral. Something about it seemed organic, almost owl-like to me. The dark gray color itself seemed to have a slight shimmering effect, waves of gray constantly shifting, a dull upon dull fuzzy effect. No other lights whatsoever. Thirty or so seconds later it was gone. I was angry my powerful flashlight was not in my possession!!