Animalistic Abomination

A sub-type of Eldritch Abomination, the Animalistic Abomination is a monstrosity that resembles one animal - or often multiple - and that resemblance can range from "significant enough to recognize" to "disturbingly accurate", while still remaining definitely "alien" on the Sliding Scale of Anthropomorphism.

This type can be even more nightmarish than your average horror due to the contrast of something so thoroughly and decidedly unnatural appearing in a form "borne" of nature. Somewhat less commonly, Animalistic Abominations may actually be a direct product of their environment, which can sometimes suggest that nature itself is harboring a severe animosity towards locals... assuming you're still currently on Earth, anyway.

If you're not, consider whether or not you're confusing your abomination of choice with a Starfish Alien: Starfish Aliens are most simply adapted to a different environment from humanity and may take on more comprehensible forms for our benefit, whereas Animalistic Abominations (or any kind of Eldritch Abomination) will feel wrong no matter how much they "should" be at home - and their form being familiar to us is anything but a good sign.

Film

 * The titular monster of John Carpenter's The Thing is first shown in the very convincing guise of a sled dog running towards an American research station in Antarctica. When it's placed in a kennel with other dogs on-site, they immediately realize it's nothing like them and act hostile towards it, just before it transforms and attacks the other dogs and absorbs most of them.

Oral Tradition, Folklore, Myths and Legends
"The locusts looked like horses prepared for battle. On their heads they wore something like crowns of gold, and their faces resembled human faces. Their hair was like women’s hair, and their teeth were like lions’ teeth. They had breastplates like breastplates of iron, and the sound of their wings was like the thundering of many horses and chariots rushing into battle. They had tails with stingers, like scorpions, and in their tails they had power to torment people for five months."
 * The Bible:
 * In Chapter 9 of the Book of Revelation, the first eleven verses describe "locusts" that are summoned from the Abyss, and appeared as armored horses with human faces, long hair, scorpion tails and leonine teeth. Unlike a typical Plague of Locusts, they were sent to torment and harm "those people who did not have the seal of God on their foreheads" for nearly half a year; they are also led by the angel of the Abyss (known as Abaddon in Hebrew and Apollyon, or "Destroyer", in Greek). From Revelation 9:7-10:

Video Games

 * Undertale has one of these in.