Erna Mohr (1894–1968) was a German zoologist whose career bridged ichthyology and mammalogy at a time when few women held senior scientific posts in museums. Self-taught in many respects after teacher training, she became curator of vertebrates at the Zoological Museum Hamburg, produced more than 400 publications, kept the international studbooks that helped save the European bison and Przewalski’s horse, and earned an honorary doctorate and election to Germany’s Leopoldina academy. Her work combined meticulous taxonomy, practical conservation record-keeping, and popular writing that brought mammals and fishes to a wider public.
Early life and dual career as teacher and volunteer
Erna Wilhelmine Mohr was born on 11 July 1894 in Hamburg, the daughter of Wilhelm Mohr, a primary-school teacher from a Holstein farming family, and Metta Elisabeth Menckloh. She attended elementary school in Hamburg and then the city’s teacher-training seminary from 1909 to 1914. From 1914 until 1934 she taught in Hamburg schools—first at a girls’ elementary school in Horn, then at a special school in Barmbek-Nord, and later at a mixed school in Dulsberg—while simultaneously volunteering at the Zoological Museum.
She began at the museum in 1912, at age 18, as an illustrator of spiders. The following year she joined Ernst Ehrenbaum’s fisheries-biology section. There she made her first notable scientific contribution: she was the first researcher to use ctenoid scales to determine the age of fishes such as pike-perch, sole and sea trout. That method supplied data used to set minimum landing sizes for commercially important species. Her first paper appeared in 1914 in the Zoologischer Anzeiger. Even while teaching full-time she published steadily on fish growth, diet and reproduction.
In 1923 she moved to Georg Duncker’s department of lower vertebrates and turned to fish systematics. Together and independently they produced taxonomic studies of viviparous halfbeaks (Zenarchopteridae), sand lances (Ammodytidae) and shrimpfishes (Centriscidae). Mohr herself described several species, including six members of the genus Zenarchopterus and, with Duncker, the surgeonfish Acanthurus nigricauda. She published in the languages of the journals that accepted her work and maintained an international correspondence that continued until her final days.
Museum leadership and the Second World War
When Duncker retired in 1934 the Hamburg education authority released Mohr from teaching so she could take charge of the fish-biology department. Two years later she also assumed responsibility for higher vertebrates and therefore for large parts of the public exhibition. She redesigned the mammal displays between 1937 and 1940. During the war she organized the evacuation of irreplaceable specimens to Rochsburg Castle in Saxony. The museum itself was hit by bombs in 1943 and much of her earlier collection work was lost. Immediately after the war she began rebuilding the holdings, soliciting material from colleagues and the public. On 1 January 1946 the university administration appointed her curator of the vertebrate department—a post she held until official retirement in 1959, though she never stopped working.
Mammalogy, zoo documentation and conservation
From the 1910s onward Mohr visited European zoos regularly, photographing and recording animals in a personal archive that often proved more complete than the institutions’ own files. She wrote monographs and handbook chapters on German and neighbouring rodents (Die freilebenden Nagetiere Deutschlands und der Nachbarländer, 1954), European seals, sirenians, wild pigs, Old World porcupines, pangolins and the extinct bluebuck. She was the first person in Germany to raise orphaned bat pups successfully on a bottle and she studied the fauna of the Kalkberg cave. A birch mouse (Sicista betulina) that reached her alive in 1936 became the subject of detailed observation.
Her most lasting practical contribution was the international studbook. From the mid-1920s she served the Internationale Gesellschaft zur Erhaltung des Wisents, keeping the pedigree register of the European bison after the species had been reduced to a handful of captive animals. After the war she and the Warsaw zoo director Jan Żabiński reconstructed the destroyed records; Heinz-Georg Klös of Berlin Zoo later credited her with special merit in the species’ recovery. She also compiled a studbook for Przewalski’s horse that reached back to 1899 and clarified the animal’s morphological variation, work that underpinned later breeding programmes. Her 1959 monograph Das Urwildpferd (translated as The Asiatic Wild Horse) remains a primary source for the early history of the species in captivity.
Honours, later years and legacy
In 1944 Mohr was elected to the Deutsche Akademie der Naturforscher Leopoldina. The University of Munich awarded her an honorary doctorate in 1950. She became an honorary member of the Association of German Zoo Directors in 1954 and, in 1966, the first woman elected an honorary member of the American Society of Mammalogists. A gold medal from the wisent society recognised her conservation work. She continued publishing after retirement despite serious illness; her last papers appeared in the year of her death.
Erna Mohr died in Hamburg on 10 September 1968. She is buried in the Garden of Women at Ohlsdorf Cemetery; a sculpture of a hutia, a rodent she had studied, stands beside the grave. In 1984 Hamburg named a street, the Erna-Mohr-Kehre, after her. Two taxa—a fossil salamander and a bat mite—bear her name. The collections she rebuilt still form part of the core holdings of the Hamburg museum, and the studbooks she inaugurated remain models for ex-situ conservation of large mammals. Her career demonstrated that systematic museum work, careful documentation of living animals and public writing could together keep species from disappearing.