When someone is inexplicably silent you might ask them “Has the cat got your tongue?”. I have no idea where this saying came from, since cats aren’t renowned for taking tongues. I think it would be far more appropriate to change the phrase to “Has the Cymothoa got your tongue?” since the Tongue-eating Louse Cymothoa exigua has track record of tongue stealing, at least in fish.
Here are some of the odd little critters in a jar of alcohol in my office:
These bizarre animals not only eat the tongue of their fish host, but they then replace the tongue and take over its normal duties.
Here’s a video that shows a live Cymothoa found by a fisherman, if you want to see them in their leg-wriggling entirety.