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. 2015 Aug 19;10(8):e0133821. doi: 10.1371/journal.pone.0133821

Fig 1. One of the portable operant devices installed in Wytham Woods, Oxford, UK.

Fig 1

The weatherproof external casing is made of opaque Perspex, while the three response keys and the section of the front panel comprising the feeding hole are transparent. The perch (bottom of the front panel) is equipped with an antenna that relays information about the unique PIT-tag combination of marked individuals to the printed circuit board located within the device.