Animals like shrews and ground squirrels can change their body temperature up match the ambient temperature up to a certain level and then maintain it steadily. Such animals are called

Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform. They are called partial regulators. Ground squirrels and shrews can change their body temperature to match the ambient temperature up to a certain level and then maintain it steadily. So, they are called partial regulators.