How elephants plan their journeys: New study reveals energy-saving strategies

(Press-News.org) UNDER EMBARGO UNTIL 05:01 GMT / 01:01 ET WEDNESDAY 26 MARCH 2025 How elephants plan their journeys: New study reveals energy-saving strategies A new study has revealed that African Elephants have an extraordinary ability to meet their colossal food requirements as efficiently as possible. Data from over 150 elephants demonstrated that these giants plan their journeys based on energy costs and resource availability. The findings – published today (26 March) in the Journal of Animal Ecology– could provide crucial information to help protect these iconic animals and their habitats.

Being an elephant is no easy task. As massive herbivores weighing several tons, they must consume vast amounts of low-calorie vegetation every day. However, their sheer size means that moving around to find food costs significant physical effort. Literally every step matters—especially in the vast, often harsh landscapes they traverse.

Understanding how elephants move through the landscape is essential for designing effective conservation strategies, particularly as habitat fragmentation and human activities continue to threaten populations. But up to now, key drivers behind elephant movements have been unclear.

The new study, led by researchers from the University of Oxford, the German Centre for Integrative Biodiversity Research (iDiv), and Friedrich-Schiller-University Jena, used GPS tracking data from 157 African elephants collected over a 22-year period (1998–2020) in Northern Kenya. Data was collected by Save the Elephants, a UK-registered, Kenya-based research and conservation charity.

Key findings:

Elephants strongly prefer landscapes with lower movement costs, with 94% of the elephants studied avoiding steep slopes and rough terrain. This suggests they are aware of their surroundings and make cost-benefit decisions to choose the most energy-efficient paths. Elephants actively select areas with higher vegetation productivity, with 93% indicating a preference for resource-rich environments. Water sources play a role in where elephants choose to go, but individual elephants can respond differently. Some remain close to water sources, while others roam farther, showing that their movement choices are more complex than travelling to the nearest river or pond. Elephants moving at speed show an even stronger avoidance of difficult, more energetically-costly terrain. 74% of individuals avoided costly areas when moving slowly, which increased to 87% when moving at intermediate speeds and to 93% when moving fast. This suggests the animals carefully balance effort and energy efficiency, especially during long journeys. According to the researchers, the elephants’ behaviour is comparable to birds appearing to deliberately use favourable thermal uplifts to reduce the energetic costs of flying.

To analyse the elephant tracking data the research team employed an innovative modelling method called ENERSCAPE, which estimates the energy costs of movement based on body mass and terrain slope. By integrating these estimates with satellite data on vegetation productivity and water availability, they built detailed energy landscapes that help explain elephants' movement decisions.

A statistical approach called step-selection functions was used to assess how the elephants chose their paths. This technique compares the locations that elephants actually visited with other nearby areas they could have chosen but did not. By doing so, the researchers identified which environmental factors play a role in elephants’ movement decisions and habitat selection.

These findings have direct applications for wildlife conservation, and could help guide the design of protected areas and migration corridors to reduce conflict with humans. The study also suggests that conservation strategies should account for individual differences in habitat preferences, particularly concerning water access.

The results could also help predict how elephant movements may respond to climate change, which affects both the energy costs of moving, and the availability of food and water.

In the future, the researchers aim to refine energy landscape models by incorporating additional factors such as seasonal changes, human disturbances, and the impact of climate change on elephant movements.

Co-author Professor Fritz Vollrath (University of Oxford) said: “While more detailed research is needed to fully understand how an elephant uses its habitat, this study identifies a central decision-making factor for travelling elephants: save energy whenever possible.”

Lead researcher Dr Emilio Berti (German Centre for Integrative Biodiversity Research and Friedrich-Schiller-University Jena) added: “These new results have important implications for assessing and planning conservation and restoration measures, such as dispersal corridors, by explicitly accounting for the energy costs of moving.”

Notes to editors:

For media inquiries and interview requests, contact Caroline Wood: caroline.wood@admin.ox.ac.uk  

Images related to this study for use in articles are available at https://drive.google.com/drive/folders/1wqdcMnrHbHx9sgxVX1me4t-JfLF90x1u?usp=sharing  These are for editorial purposes relating to this press release ONLY and MUST be credited (see file name). They MUST NOT be sold on to third parties.

The study ‘Energy landscapes direct the movement preferences of elephants’ will be published in Journal of Animal Ecology at 05:01 GMT / 01:01 ET Wednesday 26 March 2025 at https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2656.70023 To view a copy of the paper before this under embargo, contact Caroline Wood: caroline.wood@admin.ox.ac.uk

About the University of Oxford:

Oxford University has been placed number 1 in the Times Higher Education World University Rankings for the ninth year running, and ​number 3 in the QS World Rankings 2024. At the heart of this success are the twin-pillars of our ground-breaking research and innovation and our distinctive educational offer.

Oxford is world-famous for research and teaching excellence and home to some of the most talented people from across the globe. Our work helps the lives of millions, solving real-world problems through a huge network of partnerships and collaborations. The breadth and interdisciplinary nature of our research alongside our personalised approach to teaching sparks imaginative and inventive insights and solutions.

Through its research commercialisation arm, Oxford University Innovation, Oxford is the highest university patent filer in the UK and is ranked first in the UK for university spinouts, having created more than 300 new companies since 1988. Over a third of these companies have been created in the past five years. The university is a catalyst for prosperity in Oxfordshire and the United Kingdom, contributing £15.7 billion to the UK economy in 2018/19, and supports more than 28,000 full time jobs.

The Department of Biology is a University of Oxford department within the Maths, Physical, and Life Sciences Division. It utilises academic strength in a broad range of bioscience disciplines to tackle global challenges such as food security, biodiversity loss, climate change, and global pandemics. It also helps to train and equip the biologists of the future through holistic undergraduate and graduate courses. For more information visit www.biology.ox.ac.uk.

END