Flightpath Ecology provides expertise in phased microphone arrays for wildlife tracking.
Phased arrays work by direction-of-arrival, rather than time-of-arrival. They are particularly suited to tracking airborne species.

Examples are bats in flight using their echo-location calls, and tracking nesting birds in a woodland canopy. The microphone arrays are small and compact, and track airborne species from ground level.

There is no need for trailing microphone cables at the recording location because the whole array is self-contained and measures only a few cm across.

Figure 1
Flight paths made from recordings of five European bat species recorded at a location in central Denmark. The traces show the flightlines of the bats flying overhead. The microphone array is positioned at (0,0). The bats were flying from woodland positioned behind the array and flying across a river. Note that three of the species used the same flight path across the river. The N. noctula approached from the left of the array, started to cross the river, and then flew along the river. The P. nathusli caught an insect while crossing the river. A more detailed image is given in Figure 2.