blue-leaved stringybark
... that a field study found that koalas prefer the blue-leaved stringybark but only when it grows on shale-based soils?
... that a field study found that <a href="./Koala" id="mwCas" rel="mw:WikiLink" title="Koala">koalas</a> prefer the <b id="mwCaw"><a href="./Eucalyptus_agglomerata" id="mwCa0" rel="mw:WikiLink" title="Eucalyptus agglomerata">blue-leaved stringybark</a></b> <i id="mwCa4">(pictured)</i> but only when it grows on <a href="./Shale" id="mwCa8" rel="mw:WikiLink" title="Shale">shale</a>-based soils?