# Grey Knot-horn (*Acrobasis advenella*)

The Grey Knot-horn is a small moth with beautiful grey wings. It loves to hide in gardens and fields, making it a fun surprise to find while exploring nature!

- **Category:** [Insects](https://www.snappit.app/explore/categories/insect)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Habitat:** Gardens and fields

![Grey Knot-horn](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Trachycera_advenella01.jpg&width=800)

Photo: Attribution · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Trachycera_advenella01.jpg)

## Appearance

The Grey Knot-horn is a small moth with mottled greyish-white forewings marked with darker grey or black and a reddish-brown tinge near the base. It has a distinctive raised tuft of scales, its 'knot-horn,' on each forewing that helps it mimic bark. Its hindwings are plain pale grey.

## Taxonomy

- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Insecta
- **Order:** Lepidoptera
- **Family:** Pyralidae
- **Genus:** Acrobasis

## Interesting facts

- Even as adults, some Grey Knot-horns barely eat, relying on stored energy!
- Its caterpillars secretly live inside plant stems, munching away from sight!
- The 'knot-horn' on its wings is a special tuft of scales that helps it hide!
- This moth helps trees by 'pruning' weak shoots where its larvae burrow and feed.

## Special abilities

- **Bark Mimicry:** Grey Knot-horn has uniquely mottled grey wings and a raised scale tuft that perfectly camouflages it against tree bark.
- **Stealthy Larvae:** Its caterpillars can bore into plant stems, creating hidden tunnels to feed and stay protected from predators.
- **Night Flier:** The Grey Knot-horn is primarily nocturnal, allowing it to navigate and find mates under the cover of darkness.

## Measurements & details

- **Wingspan:** 19-22 mm
- **Size:** 7-9 mm
- **Lifespan:** 7-21 days
- **Leg Count:** 6

## Diet & Feeding

Its caterpillars eat plants, while the adults usually don't eat at all!

- **Age differences:** Larvae feed on leaves and shoots; adults typically do not feed or consume only water/nectar.
- **Primary Foods:** oak leaves, hazel leaves, plum leaves, hawthorn leaves, birch leaves
- **Foraging Method:** Foraging

## Ecological connections

- **Eats:** Common Oak (*Quercus robur*) — Larvae feed on shoots
- **Eats:** [Common Hazel](https://www.snappit.app/explore/common-hazel) (*Corylus avellana*) — Larvae feed on shoots
- **Eats:** Common Plum (*Prunus domestica*) — Larvae feed on shoots
- **Eaten by:** Greater Mouse-eared Bat (*Myotis myotis*) — Adult moths are prey

## Traits

- [Solitary](https://www.snappit.app/explore/traits/solitary): Solitary animals live alone for most of their lives, only interacting with others for mating or parental care.
- [Camouflaged](https://www.snappit.app/explore/traits/camouflaged): Camouflaged describes organisms that possess coloring or patterns that allow them to blend into their environment.
- [Grassland](https://www.snappit.app/explore/traits/grassland): Grassland habitats are terrestrial biomes dominated by grasses and herbaceous plants, supporting a variety of grazing animals.
- [Herbivorous](https://www.snappit.app/explore/traits/herbivorous): This trait characterizes organisms whose diet consists entirely or primarily of plant material.
- [Nocturnal](https://www.snappit.app/explore/traits/nocturnal): Nocturnal animals are primarily active during the nighttime hours, typically resting or sleeping during the day.
- [Pollinator](https://www.snappit.app/explore/traits/pollinator): Describes organisms that transfer pollen, enabling the fertilization and reproduction of plants.

## Collections

- [Insects](https://www.snappit.app/explore/collections/insects)

## Safety

**Danger:** 1/5 · Very low

It's safe to look at moths, but don't touch them as they can be delicate.

## Frequently Asked Questions

### How to identify Grey Knot-horn?

Compare resting wing shape, forewing markings, antennae and body build. Small brown moths can hinge on fine details a phone photo can't always catch. Moth Identifier: upload a photo and compare the visible details.

### What is Grey Knot-horn's wingspan?

19-22 mm

### How big is Grey Knot-horn?

7-9 mm

### How long does Grey Knot-horn live?

7-21 days

### What does Grey Knot-horn eat?

Its caterpillars eat plants, while the adults usually don't eat at all!

### Where is Grey Knot-horn usually found?

Gardens and fields

### How does Grey Knot-horn hunt?

Foraging

### How many legs does Grey Knot-horn have?

6

## More Insects

- [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*)
- [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*)
- [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*)
- [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*)

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Source: [Grey Knot-horn: Facts & Places to See — Snappit](https://www.snappit.app/explore/grey-knot-horn)