Bird
Psychological (Freud)
The bird often embodies the soul's longing to rise above its inner constraints and may mirror a repressed wish for freedom and self-realization. In depth psychology its flight also stands for ascending thoughts, desires and an inward stirring toward departure that seeks expression.
Oriental reading
In Oriental-Islamic dream interpretation in the tradition of Ibn Sirin, the bird is a messenger: a beautiful, singing bird heralds good news, travel or standing, while a caged or sick bird may point to stalled affairs. By tradition it is also often read as a symbol of the person himself and his destiny.
Animals
Dream interpretation is for self-reflection and entertainment — it is not a medical or psychological diagnosis.