Silver-Eyes or White eyes (Zosterops lateralis)
Each year thousands, perhaps millions of silver-eyes (White eyes) migrate from Tasmania as far north as south Qld, a distance greater than 1500km. The birds migrate towards the end of summer, after breeding, when they congregate in flocks.
Tagged birds recaptured at the same site in following years suggests silver-eyes (White eyes) follow the same route each year. One silver-eyes was recaptured 10 years later, so they are long lived.
Silver-eyes disperse in the spring to breed and can raise two or three broods per season with an average clutch size of three.
Not all birds migrate, however, some are resident year round.
Their liking for soft fruits has made them a prime pest in vineyards and orchards.
They generally like feeding lower down in trees and shrubs. This is possibly also influenced by their fear of aerial attack from predators (hawks, butcher birds, etc).
Silver-eyes are usually only a major pest when the orchard or vineyard has dense scrub or understorey nearby - usually less than 100metres away.
It is our experience they won't cross open country to reach a crop - unless starving - and then they'll often cover the gap in stages, i.e fly 50m and drop to the ground, fly another 50m and drop to the ground again and so on.
Silver-eye damage almost always begins along the edge of the crop, and then they eat their way in as the outer rows are eaten out.
Running a "sonic fence" along the problem boundary has proved to be the most effective way to control these birds. If pressure is high, it may be necessary to also have some sound (usually via a 360 degree speaker - Crop Gard or multi-blaster) inside the defensive line as well. This is to deal with those very hungry birds which may have "broken through" the line of speakers in the sonic fence.
Like all bird control, it is vital to have your control measures up and running before fruit colour (i.e before bird damage has commenced).