Female cats will generally go into heat four to five days every three weeks during the breeding season, although cycles vary between individuals. (veterinariannephiladelphia.com)
While symptoms vary between individuals, common symptoms include general neck pain, stiffness, swelling, and shoulder pain and low back pain. (alabamajusticecenter.com)
Then divided the species into three different groups depending on how much colour artwork varies between individuals within each species. (sciencedaily.com)