Domestic cats are too lazy to hunt. Cats sleep two-thirds of the day but they are always on alert. Cats rest a lot because they are not designed for endurance. They use high levels of energy for short periods, then rest to recover. Even when they appear to be snoozing, they are light sleepers and alert to sounds and movement around them.
Cats prefer catching rodents.
This may be true in rural areas, where studies show that birds make up 20 percent of a cat's diet. But cats are opportunists, and in urban areas where rodent populations are kept down by other means, birds may be the most readily available prey. A collar bell alerts birds. Throughout time, people have put bells on cats to keep them from catching birds, but it represents a false sense of security, according to Dr. Horton. Many times birds know exactly where the predator is.