Willow, like Ebony before her, seems to think it's her life's mission to protect the small birdies that come into the garden
Tigger's quirk is she'll yowl upstairs to tell me she's hunted one of her toys and she'll take the toy upstairs to beat it up, she refuses to beat the toy mousies up downstairs, she will only ever beat them up upstairs then bring them downstairs after they are "dead" to show me her prey