The Littlest Bird

Once there was a little bird,
Of her siblings she was third,
The eldest was a nerd.
His song never went unheard.
The next was absurd.
She often tried to fly backward.
But what was so special about the third?
Why do I write of this little bird?
Because of something often unheard.
Something that when falling this bird incurred.
She can sense those interred.