Trigger fish are remarkably good at estimating how far they have swum, perhaps because they have distance-tracking ‘grid cells’ in their brains just like we do
Source:
https://www.newscientist.com/article/2223342-fish-can-judge-distances-accurately-just-like-land-animals-can/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home