my parakeets were missing.the boy parakeet was yellow and green and the girl parakeet was white and light the morning i put the cage outside on the balcony and then later on the birds were gone and the cage was fallen down on the ground and cage door was facing toward the ground.i don't think it was a cat and there were no feathers.did someone steal them or did they escape?i really miss them. how do i get them back? please help!