I mean she's not wrong, they are really cool.
They are the most well known creature to have blue blood! This is due to the hemocyanin she mentioned. Strictly speaking it only turns blue-green-ish when oxygenated. Before that it just remains translucent. It kind of relates to how copper roofing turns blue-green-ish over time as it oxidizes, since hemocyanin has copper instead of iron like we humans do