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Tail feathers

I went to the Miners Gem in Old Town (San Diego) to work on the Carlsbad
Nodosaur like I alway do on Saturday. I found out that a Mocking Bird
had gotten into the store and one of the workers tried to get it out,
but had accdentally pulled all it's tell feathers off. I saw it flying
around with no problem today.

1), is looseing the tail feathers a defensive move?

2). Are tail feathers really needed to fly? I know birds do use them to
break and manevor, but just to fly around, is it really needed? The
reason I ask is because of Pterodactyloid pterosaurs don't have tails,
and I've often wondered how they would manever with out them. Possibly
very well, if they were like the mocking bird.