How many cervical vertebrae do all domestic mammals have?

All domestic mammals have seven cervical vertebrae, which is a consistent feature across the Mammalia class. This characteristic is an example of evolutionary conservation in vertebrate anatomy. The cervical vertebrae provide support for the head and allow for a range of motion, which includes nodding and rotation. Despite the diversity in size and shape of mammals—ranging from cats to cows—every species maintains this seven vertebrae arrangement. This consistency helps ensure that vital structures, such as the spinal cord and major blood vessels, are properly accommodated and protected throughout the variety of mammalian forms.