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Kiel University study on the long-term social memory of proboscideans
- African elephants that were separated from their zookeepers 13 years ago apparently still recognise their scent after such a long time
- The study by Kiel University (CAU) is the first to investigate whether elephants can remember individuals of another species after a long period
- Only two animals could be tested in the experiment; the results are therefore preliminary
An elephant never forgets, as the saying goes. In fact, there is evidence that proboscideans still remember the waterholes they once visited decades later. They also often recognise fellow elephants that they have not encountered for a long time. But does their excellent long-term social memory also extend to members of other species?
"There are exciting stories of Asian elephants that suggest this," said Martin Kränzlin. He carried out the study as part of his Bachelor's thesis under the supervision of Professor Christine Böhmer (Zoology and Functional Morphology of Vertebrates working group) at the Zoological Institute at Kiel University. "For example, it has been reported that elephants threw stones at a former owner they didn't like when they met again many years later. However, these are only anecdotal reports; this question has not yet been scientifically investigated."
Move from Berlin to Lower Saxony 13 years ago
The results published in the scientific journal Zoobiology now provide the first solid evidence that elephants can at least recognise the scent of their keepers, even after a long time. The study was carried out in cooperation with the Serengeti Park in Hodenhagen, Lower Saxony. It is home to two female elephants that moved from Berlin Zoo to Hodenhagen 13 years ago - Bibi and Panya.
"We contacted the former zookeepers in Berlin, a total of three men," said Kränzlin, who now works at the Wilhelma Zoological-Botanical Garden in Stuttgart. "For our experiment, they wore a T-shirt for eight hours, which we later used as a scent stimulus. We also recorded a short spoken sentence from them and took portrait photos of them."
In the actual experiment, the researchers set up two racks next to each other outside the enclosure. On one of them, they presented a stimulus from a former keeper - for example, a T-shirt that had been worn or a life-size print of a portrait photo. On the other, they presented the corresponding stimulus of a person unknown to the elephants.
Animals were more interested in the scents of former keepers
The animals could see both racks from their enclosure, but couldn't reach them with their trunks. Nevertheless, they regularly tried to do so, in order to examine the stimuli presented more closely. "We filmed the behaviour of each elephant we tested," said Kränzlin. "We then used the videos to analyse how often and for how long the animal extended its trunk towards the racks." The hypothesis behind this: If the stimulus presented seems familiar to the pachyderm being tested, this should arouse greater interest. Therefore, Bibi and Panya should try to reach such stimuli more frequently and for longer.
In fact, they did so - but only if the stimulus presented was a T-shirt. In contrast, there were no statistically significant differences between their reactions to the portrait photos and the spoken sentences. This is not entirely surprising - the proboscideans have an excellent sense of smell, but their sight is relatively blurred. "Our results are a clear indication that elephants can at least remember the scent of their former keepers, even decades later," said Professor Christine Böhmer from Kiel University, who led the study. "Nevertheless, further studies with a larger number of individuals are needed to confirm the results."
The results are also interesting for keeping elephants in zoos. Because if the pachyderms really do remember their keepers for so long, then this suggests that they are pretty important to the animals. A stable relationship with their human caregivers can therefore potentially have a very positive effect on the well-being of zoo elephants.
Photos are available for download at:
http://www.uni-kiel.de/de/pressemitteilungen/2024/160-Versuchsaufbau.jpg
The researchers set up two racks next to each other outside the enclosure. On one, they presented a T-shirt worn by a former keeper, and on the other, a T-shirt worn by an unknown person. The elephants tried to explore the keeper's shirt with their trunks more often and for longer.
© Luise Kränzlin/AG Böhmer, Kiel University
Kiel University
Press, Communication and Marketing, Eva Sittig, Text/editing: Frank Luerweg
Postal address: D-24098 Kiel, Germany, Telephone: +49 (0)431/880-2104
presse@uv.uni-kiel.de | http://www.uni-kiel.de
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Prof. Christine Böhmer
Zoology and Functional Morphology of Vertebrates
Zoological Institute
Kiel University
+49 431 880-4507
cboehmer@zoologie.uni-kiel.de
Martin Kränzlin, Idu Azogu-Sepe, Emmanuelle Pouydebat, Christine Böhmer. Do African Savanna Elephants (Loxodonta africana) Show Interspecific Social Long-Term Memory for Their Zoo Keepers? Zoobiology 2024; DOI: 10.1002/zoo.21871
https://doi.org/10.1002/zoo.21871
https://www.uni-kiel.de/en/details/news/160-elephants
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