The pattern of this feather pair can be seen when the bird is perched and facing the observer.
(The pattern of this feather pair; can be seen; T:when the bird is perched and facing the observer) (the bird; is perched; ) (the bird; facing; the observer)
The pattern of this feather pair the bird the bird
can be seen is perched facing
T:when the bird is perched and facing the observer
the observer