A keen ornithologist with a doctorate in agricultural entomology, Höller has included live birds in previous installations such as Singing Canaries Mobile (2009), and with this series takes his experimentation one step further, producing photogravures of various songbirds, which the artist cross-bred himself. The resulting portraits appear almost anthropomorphic in their individual expressions, enhancing the singular nature of these creatures, who are destined to be both the first and last of their kind.