I've made use of an old Telinga Disc http://www.telinga.com/, and bought a few components (some parts collected in the tool shed) and created this relatively cheap parabolic Stereo for Phantom 48V
The two Behringer C-2 mics are mounted on a piece of Plexiglas and connected with XLR cables.
The handle itself is collected from an Electric Drill, and a hosepipe 32mm (1 1/4'')with a setscrew (blue)is used for the fixing of the mics.
Take the cables and plugs out of the hole and seal it with foam.
A deadcat or similar like this one from Furrywindscreens is perfect. Go out and make recordings!!
Greenfinch and Bullfinch at 30 meter. Edited in Audacity, +11db and converted from wav to mp3.