Visually almost identical from any other hedgehog, Knarls are a magical variant, well known for their violent paranoia. While well able to detect which foods are good for them - such as daisies - as well as finding their ways to certain magical plants which are otherwise impossible to find - such as Raskovnik, they do not trust any food offered to them in the least. Indeed attempts to leave things such as milk, or cat or dog food out for hedgehogs by muggles have, on several occasions, led to offended and paranoid Knarls destroying the muggles garden. Fortunately for the Ministry most muggles blame such damage on teenage muggles.

Knarl quills can be used in certain potions, though this uncommon, as well as in other magical products, and they have, in the past, also been used in magical wands, though they usually need to be bolstered by something else. Knarl quills make good cores for the paranoid or extremely cautious however, and make otherwise unreliable wands consistent, which can be a comfort.

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(Info from the Wikia. I hate that I have to include this but PLEASE DO NOT DELETE THE IMAGE SOURCE OR MY CAPTION.)

Derwen Hwyl, Hafod y Llan, Beddgelert, Gwynedd

“Alone in a grazed green field, this twisted oak has grown out and onto a lonely glacial boulder. With time, the oak has taken on a knarled shape. Its silhouette almost perfectly matches the rock and knoll on which it is perched. Below the tree, sheep and cattle often rest. Sometimes children discover the tree and climb all over it. But most of the time, this tree is just growing by itself, unnoticed by the hundreds of hikers and campers who use the paths and fields just over the wall, out of sight from this peaceful oak. This is an oak which I have often wanted to celebrate because it is beautiful, welcoming, and sheltering. It is one of those trees which makes people stop and enjoy it, and often climb it. It is a giving tree.”

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Artist Kirstie Macleod shared photographs of the disintegrating dress she designed for Ruby Philogene in Phaedra directed by Sophie Hunter. According to The Times, it is made of a soluble variety of celluloid.

“The Phaedra dress at the start of the performance worn by mezzo-soprano Ruby Philogene.
Photo: Andy Staples

“The Phaedra dress towards the end of the opera. (The dress dissolved and decayed slowly during the course of the performance to reveal a knarled and twisted inner steel core).
Photo: Will O'Hare