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This is the first confirmed record of a freshwater fish preying on birds in flight, the team reports in the Journal of Fish Biology1. Rumours of such behaviour by the African tigerfish (Hydrocynus vittatus), which has been reported as reaching one metre in length, have circulated since the 1940s. But Smit says that his team was “never really convinced by the anecdotal reports”. So, when they set out to study of the migration and habitat use of these animals in a South African lake in the Mapungubwe National Park, near the border with Botswana and Zimbabwe, they were not necessarily looking for fish flying out of the water.
Nevertheless, during their time at the lake, the researchers saw as many as 20 successful fish strikes on barn swallows (Hirundo rustica) every day. These ranged from pursuits by fish at the surface, followed by leaps, to direct attacks from deeper water.