I love how my little blue birdy girl chirps incredibly quietly, completely motionless except that her tail flips at each chirp.
Also how she lurks, either hunched like a vulture or leaning forward all coiled up like a cat preparing to pounce. Oh, she's a champion lurker.
And how birdy boy attacks the wooden fruit kabob when I rotate it back into the cage. He stands on a perch, grabs the rope knot, and swings his whole body back and forth as far as he can reach, ringing the bell. And then that isn't good enough - he starts running back and forth with it. Dingdingdingdingdingdingding!