User blog comment:Tali's no.1 fan/Most Hated Enemy Of Mass Effect/@comment-1388547-20110514220347

Thresher maws. They're not too hard to kill, but the startle tactics and the random pop-up got pretty annoying, and I never worked out a reliable way to avoid the insta-kill of having one pop up under you on a high difficulty level. I eventually just took to ignoring them, except for the one you have to fight in order to investigate Adm. Kahoku's marines.