Although the displacement of native biota by introduced invasive species is well known and considered to be one of the major threats to biodiversity, it usually involves species introduced directly by human intervention, either intentional or unintentional. Less well documented is the expansion of indigenous species’ ranges as a result of habitat modification by humans. In both cases, potential negative effects of invasive species may be their suppression of native populations through predation, competition, parasitism or disease. One intriguing example is the range expansion by African Goshawks and, more recently, Black Sparrowhawks into the Cape Peninsula and the resultant sympatry with Rufous-breasted Sparrowhawks.
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July - August 2020