[JoeyP]

This will not do ...
Yes the pup is acting on instinct when it lies in wait for a small animal
and get excited when it sees it move
But your pup should Never Ever lay its teeth into you for Whatever reason
and this needs correction right away

You have to correct this on two fronts
with desensitization training and corrective training
and you can do both at the sametime
Take your biter and put her in the same room as the cage
You might wanna start with the cage empty
with the pup there open the cage ...
and when she doesn't react .... give her a treat
if she does say NO.... and close the cage and start again
after that do it with the bird in the cage ...just go to the cage first
she barks? You say no and walk away
do it again ... she barks... again walk away
repeat until you get the right response
slowly but surely shell get theidea that when she is quiet ... and not jumping she'll be rewarded
I don't know abouther other habits ... watch her mouthing things and people ... if she has been known to play nip
you need to address that too