# Krill (*Grimothea*)

Krill are tiny, shrimp-like creatures that live in the ocean. They are an important food source for many animals, like whales and penguins.

- **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Habitat:** Marine

![Krill](https://res.cloudinary.com/drieglelr/image/upload/v1771425741/objects/6191.jpg)

## Appearance

The Krill has a translucent, shrimp-like body, often with a reddish hue due to pigments from its diet. It features large, prominent black eyes and visible light-producing organs along its underside, giving it a distinctive glow in the deep ocean.

## Taxonomy

- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Malacostraca
- **Order:** Decapoda
- **Family:** Munididae
- **Genus:** Grimothea

## Interesting facts

- A single blue whale can eat up to four tons of krill in just one day!
- Krill can molt their entire exoskeleton up to ten times a year as they grow!
- Krill swarms can be denser than any animal group, with up to 30,000 individuals in one cubic meter!
- Some krill can shrink their bodies in winter to save energy when food is scarce!

## Special abilities

- **Ocean Glow Show:** Krill can glow with their own light using special organs called photophores that helps them hide from predators and communicate.
- **Underwater Sweepers:** Krill can filter-feed by using their basket-like legs to sweep up tiny plants from the water, which helps them collect food.
- **Super Swarmers:** Krill can form massive groups called swarms that helps them confuse predators and find mates more easily.
- **Quick Getaway:** Krill can rapidly swim backwards by flipping their tails, a quick escape maneuver that helps them dodge danger.

## Measurements & details

- **Size:** 10-60 mm
- **Lifespan:** 1825-2190 days
- **Leg Count:** 10

## Diet & Feeding

Tiny ocean plants are a krill's main meal, which they filter from the water.

- **Primary Foods:** Phytoplankton, Diatoms, Algae
- **Foraging Method:** Filter feeding

## Ecological connections

- **Eats:** [Blue Whale](https://www.snappit.app/explore/blue-whale) (*Balaenoptera musculus*) — They consume tons of krill daily, making them crucial for whales.
- **Eats:** Adélie Penguin (*Pygoscelis adeliae*) — Krill are a vital food source for these penguins in Antarctica.
- **Eats:** Antarctic Algae (*Phaeocystis antarctica*) — Krill graze on this abundant microscopic algae as their primary food.
- **Eats:** Weddell Seal (*Leptonychotes weddellii*) — Seals rely on krill as a major part of their diet in icy waters.

## Traits

- [Wildlife](https://www.snappit.app/explore/traits/wildlife): Wildlife encompasses all undomesticated animal and plant life existing in their natural habitats.
- [Social](https://www.snappit.app/explore/traits/social): Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring.
- [Filter Feeder](https://www.snappit.app/explore/traits/filter-feeder): Filter feeders obtain nutrients by straining suspended food particles and small organisms from water.
- [Keystone Species](https://www.snappit.app/explore/traits/keystone-species): Describes a species whose presence and role have a disproportionately large effect on its environment.
- [Marine](https://www.snappit.app/explore/traits/marine): Marine habitats encompass all saltwater environments of the Earth's oceans, supporting an immense diversity of aquatic life.
- [Glowing](https://www.snappit.app/explore/traits/glowing): Pertaining to organisms that emit light through bioluminescence or fluorescence.

## Collections

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

## Safety

**Danger:** 1/5 · Very low

If you ever see krill in the ocean, admire them from a distance and let them swim freely.

## Frequently Asked Questions

### How to identify Krill?

Look for fins, arms, tentacles, shells and body symmetry. Underwater light shifts colors, so structure and markings usually matter more than shade. Sea Creature Identifier: upload a photo and compare the visible details.

### How big is Krill?

10-60 mm

### How long does Krill live?

1825-2190 days

### What does Krill eat?

Tiny ocean plants are a krill's main meal, which they filter from the water.

### Where is Krill usually found?

Marine

### How does Krill hunt?

Filter feeding

### How many legs does Krill have?

10

## More Invertebrate

- [Coral](https://www.snappit.app/explore/coral)
- [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*)
- [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*)
- [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*)

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Source: [Krill: Characteristics, Facts & Places to See — Snappit](https://www.snappit.app/explore/krill)