1
Desert Locust
- Estimated Max Aggregation Size
- 100B+
- Brief Description
- Forms massive swarms covering hundreds of km²
Top 10Updated March 17, 2026
Top 10 Arthropods with the Largest Breeding Aggregations in Nature
This ranking lists arthropod species based on the scale and density of their aggregations during specific breeding or migration cycles. From locust swarms darkening the sky to red crab migrations, these phenomena are both biological wonders and extreme examples of energy flow in nature.
Top 3
- 1Desert Locust
- 2Antarctic Krill
- 3Mayfly
Desert Locust
1
Antarctic Krill
2
Mayfly
3
About this ranking
- Ranking type
- Not classified
- Data as of
- Not specified
- Last source review
- Not yet verified
Ranking methodology has not been provided.
References: 0. Page edits do not imply that the underlying data is newer. AI assisted in producing this content; verification status is shown above.
Interesting Facts & Summary
The Power of Swarming
The scale of these aggregations is truly staggering:
- Extreme Density: Desert locust swarms can reach hundreds of billions of individuals, covering hundreds of square kilometers.
- Ecological Impact: These migrations shape ecosystems, from red crabs altering island soil to locusts devastating agriculture.
- Survival Strategy: Swarming is not just for breeding; it utilizes the 'selfish herd' effect to reduce the risk of individual predation.
2
Antarctic Krill
- Estimated Max Aggregation Size
- 10B+
- Brief Description
- High-density schools forming massive pelagic swarms
3
Mayfly
- Estimated Max Aggregation Size
- Hundreds of millions
- Brief Description
- Mass emergence for synchronized mating and egg-laying
4
Mormon Cricket
- Estimated Max Aggregation Size
- Tens of millions
- Brief Description
- Massive flightless marching swarms destroying vegetation
5
Christmas Island Red Crab
- Estimated Max Aggregation Size
- 50M
- Brief Description
- Annual massive migration from rainforest to the sea
6
Periodical Cicada
- Estimated Max Aggregation Size
- Tens of millions
- Brief Description
- Mass emergence after long intervals in high density
7
Army Ant
- Estimated Max Aggregation Size
- 20M
- Brief Description
- Single colony size sweeping through the forest floor
8
Japanese Spider Crab
- Estimated Max Aggregation Size
- Tens of thousands
- Brief Description
- Large aggregations in shallow waters during breeding
9
European Honey Bee
- Estimated Max Aggregation Size
- 50k-80k
- Brief Description
- Swarms during colony splitting to establish new hives
10
Monarch Butterfly (Replacement: Citrus Swallowtail)
- Estimated Max Aggregation Size
- Tens of thousands
- Brief Description
- Massive overwintering clusters
| Rank | Species Name | Estimated Max Aggregation Size | Brief Description |
|---|---|---|---|
| 1 | Desert Locust | 100B+ | Forms massive swarms covering hundreds of km² |
| 2 | Antarctic Krill | 10B+ | High-density schools forming massive pelagic swarms |
| 3 | Mayfly | Hundreds of millions | Mass emergence for synchronized mating and egg-laying |
| 4 | Mormon Cricket | Tens of millions | Massive flightless marching swarms destroying vegetation |
| 5 | Christmas Island Red Crab | 50M | Annual massive migration from rainforest to the sea |
| 6 | Periodical Cicada | Tens of millions | Mass emergence after long intervals in high density |
| 7 | Army Ant | 20M | Single colony size sweeping through the forest floor |
| 8 | Japanese Spider Crab | Tens of thousands | Large aggregations in shallow waters during breeding |
| 9 | European Honey Bee | 50k-80k | Swarms during colony splitting to establish new hives |
| 10 | Monarch Butterfly (Replacement: Citrus Swallowtail) | Tens of thousands | Massive overwintering clusters |
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