Foraging behaviour and energetics of Cape gannets Morus capensis feeding on live prey and fishery discards in the Benguela upwelling system

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Collapse of South Africa's penguins in the early 21st century (2011, unknown): “In 2005, Cape gannets in the Western Cape fed primarily on low-energy fishery discards, had a higher foraging effort and exploited a greater surface area of the ocean than did those in the Eastern Cape, which ate mainly anchovy and sardine (Pichegru et al. 2007).”
Overlap between vulnerable top predators and fisheries in the Benguela upwelling system: implications for marine protected areas (2009, methodology): “Previous studies showed no significant difference in the foraging behaviour of experimental and control birds (Petersen et al. 2006, Pichegru et al. 2007), and no apparent impacts have been detected on the welfare of the animals.”