The white-tailed shrike-tyrant will perch on rocks and in trees with views of the surrounding habitats. From these lookouts, the white-tailed shrike-tyrant hunts large insects, small mammals, lizards, frogs and the eggs or nestlings of other birds (2).
The white-tailed shrike-tyrant builds its nest on the ground, in the shelter of sparse vegetation. The nest is built on a base of twigs from dry grass stems and moss, and is lined with feathers and other materials such as; horse hair, plant matter and snake skin. The nest is usually about 50 centimetres across, while inside it measures around 11 centimetres across and 7 centimetres deep (4).
The display flight of the male white-tailed shrike-tyrant consists of circling at height, repeatedly pulling its wings in and dropping down forwards before pulling back up (4).