This video says about itself:
Bird Vs Fish – Blue Planet II
26 October 2017
UK: First episode starts 8pm Sunday BBC One. Nordics and Asia: simulcasting on BBC Earth. USA: Early 2018 on BBC America. Details here.
Usually giant trevally are solitary hunters but they have come in numbers to try their luck at catching potential prey. Fledgling tern are wary to spend too much time on the water but even flying close to the surface puts them in grave danger.