He produced a number of scientific works on the birdlife of the Alps, and was the first to describe the Willow Tit.
This is supported by mtDNA cytochrome b sequence analysis; within Poecile, the Willow Tit is part of a group of Eurasian "typical chickadees" that includes also the Marsh Tit, Père David's Tit, and the Songar Tit (Gill et al. 2005, del Hoyo et al. 2007).
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- The Willow Tit is referenced in one of the musical numbers in the comedic opera "The Mikado" written by Gilbert and Sullivan, (On a Tree By a River).
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