More than 2 million birds are illegally killed during the autumn, including 800,000 on British military sovereign base areas. They are trapped by limesticks and mist net and served as ambelopoulia in restaurants. The illegal trade is estimated to be worth €15 million per annum.[4]
^Guy M. Kirwan; Manuel Schweizer; José Luis Copete (2015). "Multiple lines of evidence confirm that Hume's Owl Strix butleri (A. O. Hume, 1878) is two species, with description of an unnamed species (Aves: Non-Passeriformes: Strigidae)". Zootaxa. 3904 (1): 28–50. doi:10.11646/zootaxa.3904.1.2. PMID 25660770. S2CID 4287913.
^Avendaño, J.E.; Cuervo, A.M.; López-O., J.P.; Gutiérrez-Pinto, N.; Cortés-Diago, A. & Cadena, C.D. (2015). "A new species of tapaculo (Rhinocryptidae: Scytalopus) from the Serranía de Perijá of Colombia and Venezuela". The Auk. 132 (2): 450–466. doi:10.1642/AUK-14-166.1. S2CID 49354537.
^Alström, P.; Xia, C.; Rasmussen, P.C.; Olsson, U.; Dai, B.; Zhao, J.; Leader, P.J.; Carey, G.J.; Dong. L., Cai; T., Holt; P.I., Manh; H.L., Song; G., Liu; Y., Zhang; Y. & Lei, F. (2015). "Integrative taxonomy of the Russet Bush Warbler Locustella mandelli complex reveals a new species from central China". Avian Research. 6 (9): 1–32. doi:10.1186/s40657-015-0016-z.