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South of the Sahara the birdlife includes nearly 1,500 resident species, to which must be added another 275 species that are either resident in northwestern Africa or else are Palaearctic winter migrants; the migrants once totaled perhaps two billion individuals, but their numbers have been reduced considerably by severe droughts and by human land use and predation. Birds are mainly of Old World families, but of those that are endemic the most noteworthy are perhaps the ostrich, shoebill, hammerkop (a brown heronlike bird), and secretary bird (a large long-legged predatory bird) and the touracos (brightly coloured birds, some with helmetlike ...(100 of 33001 words)