The Homing Instinct in Animals

There are stories of animals inexplicably finding their way home after journeys of hundreds of miles, such as this one:
http://science.time.com/2013/02/11/the-m...ating-cat/

I think in its way this story of a pet travelling five miles from its new home to its old home - courtesy of the Daily Grail - is equally remarkable, because the pet was a tortoise:
https://sacramento.cbslocal.com/2019/10/...iles-away/