11.   The trematode carries out one stage of its reproductive cycle in the gut of predatory birds that dine on frogs.

12.   The West Nile virus has killed crows, some sparrows and predatory birds such as hawks and eagles.

13.   As a result the rare predatory birds abandoned their eggs, she said.

14.   As a result the rare predatory birds abadoned their eggs, she said.

15.   The delicate but hardy butterflies have survived toxic pesticides, Hurricane Andrew and swarms of predatory birds.