Long sequences of up to 60 consecutive notes may be delivered during singing encounters between rival territorial birds.

There are large, central walk-in aviary and peripheral aviaries that house the more delicate or territorial birds.

This is a highly territorial bird which will chase off not only others of the same species, but also shrikes, doves and rollers.

Brazilian Mergansers are very territorial birds defending large stretches of river and the land surrounding the fast-flowing water.

They are territorial birds and often defend their booming grounds.

It makes the hummingbird one of the most territorial birds in the world.

Jays are very territorial birds, and they will chase others from a feeder for an easier meal.

A. I learned they are as territorial as they birds they study.

When the daily costs are compared to the extra nectar gained by defending a territory, territorial birds make a net energetic profit.

Field studies show that territorial birds need to spend less time per day foraging to meet their daily energy requirements when the flowers contain more nectar.