Part of my Half-Life Fact Files series: http://www.youtube.com/playlist?list=PLDmcwfn8y0lMtlqcpUhggk0FB1EC2i3iB
This edutainmentional Fact Files episode floats on over the cut Xen alien, the Flocking Floater aka the Bloater aka the Stingsail.
Music:
Half-Life (Kelly Bailey) - Sirens in the Distance
