Another meaning of "swallow"

I was writing to English dictation as usual. In the dialogue, a speaker said;
"Is it difficult to swallow the camera?"

To swallow the camera?! The meaning of "swallow" I know was just a kind of bird. I tried to use my imagination as much as possible.

I wonder if "swallow" is also used as a verb. If so, what does it mean? Does it means "to fly like a swallow" or something? But how does it relate to the camera?
This dialogue was about a medical checkup, so I could imagine fully that the camera meant a gastro camera.

Finally I checked the text book.
Oh!! It means taking something such as pills, foods or drinks. I see.

So does it have something to do with a swallow of a bird?