The Buff-Tip Moth: the resting posture, shape, and color/pattern of the buff-tip moth allows it to mimic a broken birch twig; the moth's buff-colored head and the patches on its hindwings even resemble freshly-snapped wood
It also definitely tends to look like there's a weird little smiley face in the setae surrounding the moth's head, which is arguably even more striking but for some reason none of the sources I dug up on this species seem to mention that weirdness.
This type of camouflage is generally referred to as a "protective resemblance" -- a form of mimesis in which an animal can avoid being preyed upon by mimicking an inedible/unremarkable aspect of its environment. Many different moths are able to disguise themselves in similar ways, and it is especially common within the family known as Lasiocampidae. Some of the other species that engage in protective resemblance include Gastropacha quercifolia, Gastropacha pardale, Gastropacha populifoli, Euthrix potatori, Euthrix laeta, and Calyptra minuticornis (along with the other members of genus Calyptra). Most of these moths disguise themselves as leaves/foliage.
The buff-tip moth is particularly adept at disguising itself, however, and the fact that it so strongly resembles such a specific object (i.e. not just a dead leaf or a vague piece of foliage -- but a broken twig from a silver birch tree, in particular) makes this disguise seem even more impressive/unique.
This species (Phalera bucephala) can be found throughout the British Isles, mainland Europe, and Asia, with its range extending into Eastern Siberia.
Photo 1 by thijsvalkenburg, 2 by nikiescott, 3 by fubr, 4 by Bernard Dupont, 5 by qgrobler, 6-7 (cocoon before and after moth emerged) by nikiescott, 8-9 by wolfachim, and 10 by suncana
look. so many people use the classist card for this, but if you can't afford to feed an animal a diet that's not going to cause serious medical issues that will either kill it or require medical treatment for the rest of the animal's life, then maybe you shouldn't own this animal. "poor people deserve to have animal companions too" yes absolutely i agree, but maybe not at the expense of the animal's health.
A very famous moth, the African death's head hawkmoth :) Named after the skull shape on their back, though honestly i dont care about the skull, i care about the fact that they can SQUEEK!!!