Oxalate‐degrading bacteria, including Oxalobacter formigenes, colonise the gastrointestinal tract of healthy koalas (Phascolarctos cinereus) and those with oxalate nephrosis Publications https://onlinelibrary.wiley.com/doi/abs/10.1111/avj.12799 https://onlinelibrary.wiley.com/doi/abs/10.1111/avj.12799