Some species of fish are known to feed on stationary²（静止的） birds but experts say this is the first evidence of one catching birds on the wing. 

 

Tigerfish are a predatory freshwater species that are best known for their large, razor-sharp teeth. 

 

The behaviour was filmed at Schroda Dam, a man-made lake in Limpopo Province, South Africa.

 

Researchers from the Water Research Group of North West University, South Africa, described their findings in the Journal of Fish Biology.

 

"The African tigerfish is one of the most amazing freshwater species in the world," said Prof Nico Smit, co-author of the study. 

 

"It is a striking fish with beautiful markings on the body, bright red fins⁴ and vicious teeth." 

 

The fish, Hydrocynus vittatus, is known as a voracious⁵（贪婪的） predator³ and according to Prof Smit, its characteristic jump makes it a favourite species for freshwater anglers.

 

It is a protected species in South Africa and Prof Smit and colleagues were conducting a study into how it uses different habitats in Schroda Dam.

 

Using radio tags to monitor the movements of individual fish, researchers found that they primarily fed on other fishes at dawn and dusk and withdrew to rest in deep, sheltered areas during the day.

 

But during a summer survey, the team recorded some unusual activity. The tigerfish swam out to open water in the mid-morning and were seen preying⁶ on swallows as they skimmed over the lake's surface.

 

Prof Smit said the team were "extremely surprised" by the behaviour which they were able to capture on film.

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