OWL:

The owl is sacred to the Greek goddess of learning, Athena and is even
depicted on some Greco-Roman currency as a symbol of status, intelligence and of course, wealth.

In ancient Egyptian, Celtic, and Hindu cultures the symbolic meaning of owl
revolved around guardianship of the underworlds, and a protection of the dead.

A quick-list of owl symbolic meanings:

Wisdom, Mystery, Transition, Messages, Intelligence and Mysticism.

During medieval times in western and central Europe it was fabled that owls
were actually priestesses (witches) and wizards in disguise. To this day the
owl is considered a witch's familiar (an animal soul-spirit linked to a
spiritual person via a unique, communicative bond).

LARK:

An Old World bird characterized by an unusually long,
straight hind claw. It was symbolic merriment as the lark sang hymns at the
gates of heaven; the lark was the bird that announced the coming of the day.
Because of the bird's boundless energy, it is said the lark is also the symbol
of hope, happiness, and of good fortune; creativity.

NIGHTGALE:

The Nightingale with its
beautiful night song, is the bird of love, for as long as it sings,
the dark night shelters secret lovers from the eyes of those who may part them.

Christians considered
the Nightingale's song, a plea for help from the lost souls trapped in
Purgatory; it was a cry of longing for one's heavenly home; or an omen of death.