If I put another nest out for same bird will the task be the same?

Yes and No
These are the groups of the birds that nest
Group 1: Wren, Yellow Wagtail, Chaffinch, Singing Bush Lark
Group 2: Nightingale, Bee Eater, Roadrunner, Waxwing
Group 3: Kingfisher, Oriole, Chickadee, Blue Jay
Group 4: Woodpecker, Magpie, Jackdaw, Crane
If you have one of the birds in a group in a nest, the task will be to spot one of the birds in the same group. It can indeed be the same bird you've already done or one of the other birds in that group.
So Yes the task may be the same or No it may be one of the others in the group.
If I make sense xx

Thanks Karen, so I could have an easier task than finding 5 cranes xx

Yes you could, bless and I hope you do. But still a small chance you will get the same task. x

Hi Donna-Marie - just to clarify if you have a bird already in a nest and it has given you a task, if you get a second nest out and get a second bird nesting the second bird will send you for a different bird from the same group so you can change up which task you get.  If you shoo the bird away there is a chance once you get a bird nesting again that it will send you, as Karen has said, for the same task as before.

That is, you need two birds nesting in the garden at the same time to guarantee you will be given a different task.

Peta I read this too late as no notification that you’d posted, I shooed the maggie away!
I know for next time. Thanks xx