The facial disc is white and the eyes are yellow.

The head is large, with yellow eyes and a well-defined facial disc.

There is a black border to the facial disc and white stripes above the yellow eyes.

They are long winged and have the characteristic facial disc.

Its facial disc is dark brown with white spectacles.

They lack ear tufts and have a flattened facial disc.

The facial disc was white behind and below the eyes, fading to grey with brown stripes towards the centre.

The feathers of the facial disc are arranged in order to increase sound delivered to the ears.

Other bird species, such as harriers, have less prominent facial discs.

The juvenile is even more distinctive than the adult, being completely white apart from a chocolate brown facial disc.

There are prominent white supercilia above the facial disc.

Facial disc light grey with whitish markings, short white eyebrows.

One of the functions of their facial disc is to transmit sound to the ears.

The shape of a bird's head can also affect its hearing, such as owls, whose facial discs help direct sound toward their ears.

It has a round head with plain buffish-grey facial discs, orange-yellow bill and small black eyes.

This owl does not have ear tufts and has the largest facial disc of any raptor.

Its large rounded head lacks ear tufts, and the facial disc surrounding the dark brown eyes is usually rather plain.

As noted above, the facial disc helps owls to funnel the sound of prey to their ears.

The facial disc is fulvous-brown, with a distinct black or dark brown frame that becomes broader towards the neck.

This small owl's facial disc feathers extend past its head, which gives it the appearance of having long ear tufts.

They tend to have large heads, short tails, cryptic plumage and round facial discs around the eyes.

Juvenile Tengmalm's uniformly rufous, including most of facial disc, except for eyebrows.

The barn-owls' main characteristic is the heart-shaped facial disc, formed by stiff feathers.

The underparts are unstreaked buff, becoming darker on the upper chest and facial disc.

The subspecific name castanops, meaning "chestnut-faced", comes from the colouring of the facial disc.