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Related Experiment Video

Updated: Sep 10, 2025

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Thermoregulation strategies differ for large macropods during high temperatures.

Loic Q Juillard1, Lisa M Ashby1, Taylor J McEvoy1

  • 1Centre for Compassionate Conservation, TD School, University of Technology Sydney, Ultimo 2007 NSW, Australia.

Journal of Thermal Biology
|August 23, 2025
PubMed
Summary

As temperatures rise, kangaroos increasingly seek shade and water. Eastern grey kangaroos prefer dams, while red kangaroos strongly select shade, highlighting the need for landscape features for wildlife survival.

Keywords:
Canopy shadeMacropus giganteusOsphranter rufusSemi-arid drylandsThermoregulationWaterpoints

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Wildlife Conservation

Background:

  • Semi-arid drylands face increasing temperatures due to climate change.
  • Landscape features like water and tree shade are crucial for mitigating heat stress in wildlife.
  • Anthropogenic activities have led to canopy loss and altered water availability in Australian drylands.

Purpose of the Study:

  • To investigate the use of water sources and tree shade by eastern grey kangaroos (Macropus giganteus) and red kangaroos (Osphranter rufus) in response to temperature.
  • To understand how landscape modifications (dammed watercourses, earth tanks) influence kangaroo behavior during heat events.

Main Methods:

  • Utilized thermal drone, camera traps, and temperature sensors to monitor kangaroo activity and environmental conditions.
  • Examined the correlation between ambient temperature and the utilization of sun, shade, and water resources by kangaroos.
  • Compared the preference of kangaroos for different water sources (dammed watercourses vs. excavated earth tanks).

Main Results:

  • Kangaroos avoided sunny areas as temperatures increased; eastern grey kangaroos spent <50% of time in sun above 28°C, red kangaroos above 17°C.
  • Shade use by kangaroos positively correlated with temperature, with red kangaroos showing stronger shade selection.
  • Eastern grey kangaroos significantly increased waterpoint activity above 28°C, preferring dammed watercourses over earth tanks; red kangaroos showed a weaker preference for dams at very high temperatures (>36°C).

Conclusions:

  • Wildlife persistence in warming semi-arid environments is increasingly dependent on the availability and maintenance of essential landscape features like water and shade.
  • Conservation strategies should consider the provision of accessible water and adequate tree canopy cover to support large macropod populations under climate change.
  • Differential use of resources by eastern grey and red kangaroos suggests species-specific habitat management needs.