These problems are replicated in savannahs globally: Brazil’s Cerrado is heavily converted for agriculture and under pressuce from invasive species (Klink and Machado, 2005); India’s savannah reserves are increasingly isolated (Vidya et al,. 2004) and an interventionist strategy is increasingly applied (Madhusudan and Shankar Raman, 2003); Australian savannahs are suffering biodiversity losses from lost heterogeneity (Bird et al., 2008).