Andrzej Elżanowski

Andrzej Elzanowski was born on 21 January 1950 in Przasnysz, in north-eastern Poland. He finished the local lyceum in 1967 and studied zoology at the Faculty of Biology of the University of Warsaw, completing a master's degree in 1972. His 1979 doctorate examined fossil embryos and models of the evolution of avian reproduction. In 1996 he habilitated at the University of Wroclaw with a thesis on Mesozoic avian evolution and the main phylogenetic lineages of birds, and in 2003 he received the title of professor of biological sciences.

From 1972 to 1983 Elzanowski worked as an assistant and adjunct at the University of Warsaw. He then spent 1983 to 1998 on research appointments in the United States and Germany before returning to Poland as head of the Department of Vertebrate Zoology at the University of Wroclaw (1998-2009). He was affiliated with the Museum and Institute of Zoology of the Polish Academy of Sciences and later with the Faculty of Artes Liberales at the University of Warsaw.

His research focused on bird phylogeny and Mesozoic birds, especially Archaeopterygiformes. With Peter Wellnhofer he described the coelurosaur theropod Archaeornithoides in 1992. He contributed the Archaeopterygidae chapter to Mesozoic Birds: Above the Heads of Dinosaurs (eds. Luis Chiappe and Lawrence Witmer). In 2001 he argued that the Solnhofen specimen of Archaeopteryx represented a new genus and species, Wellnhoferia grandis. He reconstructed the bony palate of Hesperornis, linked toothed Odontognathae more closely to modern birds, and analysed the skull of Confuciusornis as evidence of sit-and-wait foraging. His detailed morphology of the avian quadrate bone entered the standard description of fossil birds and helped identify new finds in North America, Australia and Asia. With Antoine Louchart he also studied living and fossil ostriches, documenting skeletal sexual dimorphism and confirming the extinction of the highland ostrich subspecies Struthio camelus spatzi in north-west Africa. He authored more than a hundred scientific papers and sat on bodies including the Committee of Evolutionary and Theoretical Biology of the Polish Academy of Sciences and the scientific council of the Institute of Paleobiology.

Elzanowski was a vegan and a central figure in Polish animal-ethics debates. He served on the National Ethics Committee for Animal Experiments in its first term (1999-2003), was a leading co-author of the successful 2010 amendment to Poland's Animal Protection Act, and architected a 2012-2014 campaign against ritual slaughter. He helped strengthen the 2015 Act on the protection of animals used for scientific or educational purposes by introducing a two-thirds qualified majority requirement for local ethics committee approval of animal experiments. He chaired the Polish Ethical Society and served on Warsaw's first Local Ethics Committee for Animal Experiments. In 2022 he criticised the Institute of Nature Conservation's labelling of the domestic cat as an invasive alien species as scientifically and ethically unjustified. His brothers included lawyers and scholars Marek and, in the next generation, Filip Elzanowski. In 2004 Przasnysz awarded him the Coryphaeus of Przasnysz statuette.

Andrzej Elzanowski died on 9 September 2026 at the age of 76 after a serious illness. Polish media including TVP Info, Radio ZET and Dzien Dobry TVN reported the news, and the animal-protection organisation OTOZ Animals remembered him as an uncompromising advocate for animals.

Elzanowski left a dual legacy in vertebrate palaeontology and in Polish animal law. His work on Archaeopteryx, Wellnhoferia, Archaeornithoides, Hesperornis and Confuciusornis remains cited in Mesozoic bird phylogeny, while his quadrate morphology became a standard tool for identifying fossil birds. In public life he helped rewrite Poland's animal-protection statutes and kept ethical scrutiny of animal use at the centre of scientific policy. Colleagues and campaigners described the loss of a scientist who treated birds as both evolutionary subjects and moral patients.