A mummified cat on display at the British Museum, London.
In the late period of Egypt existed a cult dedicated to the cat goddess Bastet. During this period cats were mummified and presented to pilgrims who presented them to Bastet. as an offering.
X-rays show that the cats were killed by having their necks broken and their bodies were dried out using natron salt (similar to the way in which human bodies were mummified). They were then elaborately wrapped with the forelegs lying down the front and the hind legs drawn up beside the pelvis.
The cult was based in a town named Tell Basta where graveyards have been found with thousands of mummified animals, including specifically, cats.