This is used to deter birds while they are perching in shrubbery, being unusual in the family by exposing themselves during the day.

However, the blunt spikes are less effective at deterring birds, and cannot block climbing animals.

Thus ultrasonic scarers often have little or no effect in deterring birds.

The creation of roads and logging deters birds and other animals from living in those sections of the forest.

Netting over brassicas may have been weakened by snow and need attention to deter ravenous birds.

In later instars, the eyespots on the thorax serve to deter birds.

But they don't seem to deter smaller, gentler birds like swallows and songbirds.

Each box is fitted with a high-tech camera system and is big enough to deter other birds from nesting inside.

The department is considering other methods to deter birds.

An unusual feature of the stadium is the model owls in each corner, to deter birds from nesting in the roof.