The Little Owl (Athene noctua) is a small nocturnal bird of prey, weighing between 0.22 pounds (99.79 g) and 0.55 pounds (249.48 g). It can be found all around Europe, Central Asia and, in a scattered form, in North Africa.

The Barn Owl (Tyto alba) is a nocturnal bird of prey recognized by its white heart-shaped face. It is one of the birds with the widest distribution on the planet, being possible to find it on all continents, except Antarctica. It has a silent flight and a very characteristic vocalization, similar to a scream.

The Eurasian Eagle Owl (Bubo bubo) is the largest nocturnal bird of prey in Portugal and can weigh between 3 pounds (1.36 kg) and 10 pounds (4.54 kg). It is easily recognized by its huge orange eyes and tuft of feathers on its head. With an excellent hearing, vision and completely silent flight, this species is an excellent hunter.