Amoeba are gluttons. Some will try to eat just about anything they can wrap their pseudopodia around (for those who don’t know, pseudopodia are the parts of the amoeba that stick out like tentacles)
Some amoeba are large enough to eat just about anything on the microbial menu, like the immense Chaos chaos amoeba (yes, that’s the scientific name!) However, this amoeba I found doesn’t seem to know its limits. The diatom it is trying to ingest is probably too large, and the amoeba will most likely spit it out later. Although I didn’t stick around to see the amoeba expel it, I have seen other cases of amoeba “throwing up” food that was too big for them.