# Biomechanical limits of hopping in the hindlimbs of giant extinct kangaroos

## TL;DR

This study explores whether giant extinct kangaroos could hop based on their biomechanics, finding that their bones and tendons could support hopping movements.

## Contribution

The study integrates modern and fossil data to test biomechanical limits of hopping in giant kangaroos, revealing new insights into their locomotion.

## Key findings

- Giant kangaroo metatarsals could resist bending moments during hopping.
- Their calcanea could accommodate large tendons to handle hopping loads.
- Hopping may have been part of their locomotor repertoire despite large size.

## Abstract

The locomotor abilities of animals depend upon their body size. Today, kangaroos are the largest hopping mammals, but some of their Pleistocene relatives were larger still—more than twice as heavy as any modern kangaroo. So, is there an upper size limit of bipedal hopping? Previous analyses have recovered an upper limit of ~ 140–160 kg based on allometry, but have suggested that incorporating changes in hindlimb scaling patterns among giant species would alter these conclusions. Here, we test this proposal by integrating scaling data from modern kangaroos with direct observation of the hindlimb bones of giant fossil kangaroos. We test two potential limiting factors on hopping—bone strength, and tendon size. We find that (a) the metatarsals of giant kangaroos would be capable of resisting the bending moments involved in hopping, and (b), the calcanea (heel bones) of giant kangaroos could accommodate tendons large enough to resist the loads generated during hopping. While hopping may not have been their primary mode of locomotion, our findings suggest that it may have formed part of a broader locomotor repertoire, for example for short bursts of speed.

The online version contains supplementary material available at 10.1038/s41598-025-29939-7.