1. in flocks
1. Other challenges for bird flu control include the difficulty of vaccinating all courtyard farm flocks in some remote mountainous areas.
2. in flocks
2. Bird flu is endemic in flocks across Indonesia and has killed at least five people this year.
3. The more it becomes entrenched in poultry flocks, the greater the risk that more humans will become infected.
4. Flocks of exuberant English supporters prepared for the game by heading to bars in the morning.
5. In summer and autumn, numerous little flowers bloom while flocks of cattle and sheep graze on the grass.
6. Flocks of sheep and goats leisurely graze on the meadow slopes in Guizhou province.
7. Those boating on the lake are immersed in a vista of crystal clear water and perhaps amused by the flocks of wild ducks flying by.
8. Bird flu devastated flocks in several regions in Siberia and the Urals during the summer, and last week it hit a village about 200 miles south of Moscow.
9. This is where the nomadic Mongolian herdsmen live with their flocks, and they will likely point you in the right direction.
10. In some cases, airports bring in predatory hawks to chase away flocks of smaller birds.