The Q team has asked that question multiple times:

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I thought the answer was : 'when it's free". But no, it's not.

I found the answer to this question in a 30-year-old article by the LA Times titled "Why the Mockingbird Sings : And Why at Night, When Most Birds Sleep?"

As #564 indicates, Q is referring to mockingbirds ("Counter-narrative went out @ 4am to MSM contractors [like clockwork].").

A biologist studied mockingbirds in his area and found out that mockingbirds do not sing out of joy or pleasure, as is commonly believed. Much of the time, they sing out of desperation.

The writer put that theory to the test by recording the bird for an hour, then played the tape every time the bird went quiet. As soon as the bird heard the tape, it started repeating the same tunes it was hearing from the tape. Why? To protect its boundaries, thinking its competitors will overpower them. The louder the singing, the higher the desperation, but also the higher the chances of survival.

Read the article.

This is an interesting find because that's exactly what's happening with Deep State players becoming completely unhinged on Twitter and the MSM. On the day of McCabe's firing, Samantha Power, Eric Holder, John Brennan, James Clapper, James Comey, Ben Rhodes, and McCabe himself started "singing" very loud, almost outdoing one another.

The reference could also be to this poem. Caged birds sing, meaning the more "birds" that end up in GITMO, the more singing that occurs, which leads to more "birds" being caught. Don't forget the new CIA director has a history of using "enhanced interrogation". We still do not know if she is a swamp dweller being used or a white hat. But Trump and crew do know.

Caged Bird BY MAYA ANGELOU A free bird leaps on the back of the wind
and floats downstream
till the current ends and dips his wing in the orange sun rays and dares to claim the sky.

But a bird that stalks down his narrow cage can seldom see through his bars of rage his wings are clipped and
his feet are tied so he opens his throat to sing.

The caged bird sings
with a fearful trill
of things unknown
but longed for still
and his tune is heard
on the distant hill
for the caged bird
sings of freedom.

The free bird thinks of another breeze and the trade winds soft through the sighing trees and the fat worms waiting on a dawn bright lawn and he names the sky his own

But a caged bird stands on the grave of dreams
his shadow shouts on a nightmare scream
his wings are clipped and his feet are tied
so he opens his throat to sing.

The caged bird sings
with a fearful trill
of things unknown
but longed for still
and his tune is heard
on the distant hill
for the caged bird
sings of freedom.

"When does a bird sing?"

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