I'm curious whether her smug expression means that bit of text is something that makes the second panel especially predictable/warranted.
And mantis shrimp are amazing little buggers (though I wouldn't want to get too close, for reasons ukshadow mentions). Would also love to see a pistol shrimp version of this scenario.
That reminds me I had a mantis shrimps as a lunch about two weeks ago and its delicious, removing the exoskeleton is a bit of pain in the ass because it's a bit spiky on the edges.
I'm surprised she identifies it as a slave instead of delicious munch munch. O_O
Too big.
Yukkuri regularly identify living beings larger than themselves as "slaves" (humans, for example), but the only time you see them declare a living, moving creature to be "munch-munch" is with very small things like worms, beetles, and butterflies, or with fellow yukkuri who have had their accessories and hair removed (which makes other yukkuri view them as "sweet-sweets" rather than yukkuri).
I specify "moving" because the vegetables they eat are living, too, and are bigger than themselves, but because they're plants, not animals, the simplistic yukkuri mind probably doesn't even realize they're living things too.
Anyway, the mantis shrimp is probably too big to be munch-munch. I wouldn't be surprised if this one only even decides it's a potential slave because she's used to being treated as special.