Dove
A dove was a type of Earth bird, that often served as a symbol for peace.

In 2257, Commander Jett Reno, after awaking from unconsciousness, groggily noted that she had been dreaming about playing drums for  in a parade with doves. ()

The insignia for two 23rd century Federation mental health facilities: the Tantalus Penal Colony and the Elba II asylum featured a dove. ()

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Earth animals
Avians