Blast-Ended Skrewts are magical creatures. They look like deformed lobsters, with legs sticking out in very odd places, and have no visible head or mouth.

From the Story

Harry Potter and the Goblet of Fire

Discovered in chapter 13, Mad-Eye Moody

Hagrid produces about a hundred Blast-Ended Skrewts for the fourth-year students to study in their Care of Magical Creatures lesson. The newly hatched Skrewts are about six inches long; they look like shell-less lobsters, horribly pale and slimy-looking, and give off a very powerful smell of rotting fish. Contained in crates, the Skrewts crawl over each other, bumping blindly into the sides of the boxes. Every now and then, sparks fly out of the end of a Skrewt and, with a small phut, it is propelled forward several inches

Some of the Blast-Ended Skrewts have stings on them, which Hagrid thinks are the males; the female Skrewts have sucker-like additions on their bellies, which he thinks might be to suck blood. Hagrid isn't sure what the Blast-Ended Skrewts like to eat, and gives the students ant eggs, frog livers and some grass-snake to experiment with.

Discovered in chapter 16, The Goblet of Fire

The Blast-Ended Skrewts have become much larger, growing to nearly three feet long. Hagrid says that the Skrewts have started killing each other and are now being kept in separate crates.

Discovered in chapter 18, The Weighing of the Wands

Hagrid explains that the reason the Skrewts have been killing each other is due to an excess of pent-up energy, and thinks the best solution is for the students to take them for a short walk.

Discovered in chapter 21, The House-Elf Liberation Front

The Skrewts are placed in boxes in the pumpkin patch by the fourth year students in an attempt to discover if they hibernate or not. The creatures apparently do not hibernate, and do not appreciate being forced into the pillow-lined boxes and nailed in. They rampage around the pumpkin patch, the wreckage of the boxes strewn around them. They are eventually restrained and tied up by Hagrid and some of the students.

Discovered in chapter 31, The Third Task

An enormous Blast-Ended Skrewt is one of the creatures hidden in the maze for the third task. The Skrewt is ten feet long, and looks more like a giant scorpion than anything. The Skrewt is defeated when Harry hits its fleshy, shell-less underside with the Impediment Jinx.

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