A non-native African sulcata tortoise (Centrochelys sulcata) munching on an invasive grass at the Makeuwahi Cave Reserve in Kaua'i, Hawaii. Non-native tortoises are increasingly being used to replace recently extinct island herbivores. Encouragingly, these tortoises predominantly feed on fast-growing invasive species, and likely help shifting the competitive advantage back towards native species. [photo credit: D.M. Hansen]
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