Outside our bedroom is a tree and a shrub, and there seems to be a bird nesting in said tree, because whenever they spot a cat in the window, they hop around atop the shrub and shriek at them. They have become Kenma's mortal enemy. The bird gives zero fucks.

A floofy calico cat named Kenma with white, gray, tan, brown, black and orange fur shuffles in and out of our bedroom windowsill, yowling and chirping at a bird who is hopping around on a shrub outside, yelling at Kenma, likely because they are nesting in the tree beside the shrub. This happens several times a week now and Kenma never gives up on finally clawing her way through the glass and showing that bird who's property this is (Kenma is all meow and no bite and would likely run away in mortal fear if an angry bird came flapping at her face).