Faecal particle size and tooth wear of the koala (Phascolarctos cinereus)
William EllisA,B,E, Rachael AttardC, Stephen JohnstonB, Peter TheilemanD, Allan McKinnonD and David BoothC
ACentre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Qld 4072, Australia.
BWildlife Biology Unit, School of Agriculture and Food Sciences, The University of Queensland, Gatton, Qld 4343, Australia.
CSchool of Biological Science, The University of Queensland, Brisbane, Qld 4072, Australia.
DQueensland Department of Environment and Heritage Protection, Moggill Koala Hospital, Moggill, Qld 4070, Australia.
ECorresponding author. Email:
We used computer-aided image analysis of leaf fragment particles found in faecal pellets of 45 koalas, representing the range of tooth wear in this species, to investigate how tooth wear in the koala inﬂuences faecal particle sizes. Although the range of sizes of particles produced did not vary between koalas across different tooth wear classes, with all koalas producing small, medium and large particles, koalas with advanced tooth wear produced a greater proportion of larger particles.This observation may prove useful for demographic population analyses based on scat surveys since the broad age class of individual koalas can be estimated from faecal pellet analysis. Older koalas produced faecal pellets containing a higher proportion of the largest-sized particle sizes (those greater than 0.59 mm2) than either young or mature koalas but there was no difference detected between mature and young koalas.
Additional keywords: faecal pellets, population age structure, tooth wear.