Cats are natural predators, and as such, they are biologically wired to hunt and kill small animals such as birds. This instinct is deeply ingrained in their DNA, and even domesticated cats still retain this predatory behavior.
Additionally, birds can be attractive to cats because they move quickly, make high-pitched noises, and have bright, colorful feathers that can catch a cat's attention. Cats are also curious animals, and they may be drawn to birds simply because they are new and interesting.
It's important to note, however, that not all cats like birds, and even those that do may not necessarily want to harm them. Some cats may enjoy watching birds from a safe distance, while others may view birds as potential playmates rather than prey. Ultimately, each cat is an individual with its own personality and preferences.