Messor structor
Harvester ant
Also known as European harvester ant (trade name; also used for other European Messor species)
A large seed-harvesting ant of southern and central Europe. Several queens, thousands of workers and a rewarding first harvester colony.
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- Origin
- Europe (Southern and central Europe, extending into North Africa and western Asia)
- Difficulty
- Beginner level
- Worker ant length
- About 4–10 mm
- Colony size
- Thousands of worker ants
- Queens
- Several queens (polygynous)
- Winter rest
- Required
- Climate
- Temperate
About this species
Messor structor is a seed-harvesting ant of southern and central Europe, with a range that extends into North Africa and western Asia. It lives in dry, open habitats such as steppe and sandy grassland.
Workers collect seeds through the warm season and store them in underground granaries; worker sizes vary from about 4 to 10 mm, which makes the colony interesting to watch. Colonies often have several queens and can grow to thousands of workers, and some populations form large networks of connected nests.
Ant-keeping sources describe it as one of the easier ants to start with. It needs a cool winter rest and a steady supply of seeds, which makes it a good choice for a first colony. The name Messor structor may cover several closely related species, so ask ANTELYX which population a colony comes from.
Identification
A large seed-harvesting ant with strongly varying worker sizes. Workers are dark brown to black and carry stiff hairs.
- Worker ant length
- About 4–10 mm
- Worker ant colour
- Dark brown to black, often with a brown or reddish tinge
- Worker ant sizes
- Polymorphic (many worker sizes)
Taxonomy notes. The name Messor structor is used for a group of closely related ants. Research on Central European populations found more than one species, so the exact identity of a colony depends on where it comes from (Schlick-Steiner et al., 2006).
Natural habitat and range
Dry, open habitats such as steppe, sandy ground, grassland and other well-drained open areas.
Southern Europe (including the Iberian Peninsula, France, Italy and the Balkans), through North Africa and into western Asia. The range reaches the southern parts of Central Europe.
Behaviour
Workers harvest seeds throughout the warm season, remove the seed appendages and store the seeds in underground granaries.
Colonies can accumulate large seed stores in underground chambers.
Colony development
Colonies often have several queens and can grow to thousands of workers.
Some populations form large networks of connected nests without clear borders between them.
- Queens
- Several queens (polygynous)
- Typical size
- Thousands of worker ants
- Maximum size
- About 5,000 worker ants are reported in the wild; larger captive colonies are anecdotal.
Care requirements
Ant-keeping sources agree on a nest temperature of about 22–26 °C, seeds as the staple food with small insects for protein, and a cool winter rest of a couple of months. The sources differ on the rest temperature and length (for example 10–15 °C for 2–3 months, or about 15 °C from November to February) and on humidity, so those figures are not published.
- Temperature
- 22–26 °C
- Winter rest
- Required
- Experience level
- Beginner-friendly: a good first harvester ant for new ant keepers
Feeding
Mainly seeds, which workers collect and store in underground chambers. Ant keepers also offer small insects as protein.
Nest requirements
Nest requirements for this species are being verified.
Available Colonies
Colonies of this species that are currently listed. Not sure which to choose, or want to know more? Ask us before you order.
Shipping notes
Whether this species can be shipped depends on your destination country. Check the shipping information before you order.
Frequently asked questions
Questions about this species.
What does Messor structor eat?
Mainly seeds. Workers collect them and store them in underground chambers. Ant keepers also offer small insects as protein.
Does it have more than one queen?
Colonies are often polygynous, which means they can have several queens.
Is Messor structor a single species?
The name is used for a group of closely related ants. Research on Central European populations has found more than one species, so the exact identity of a colony depends on where it comes from.
What temperature does it need?
Ant-keeping sources agree on about 22–26 °C for the nest.
Does it need a winter rest?
Yes. Ant-keeping sources recommend a cool winter rest of a couple of months; the exact temperature and length differ between sources.
Is it a good ant for beginners?
Ant-keeping sources describe it as one of the easier species to keep.
Is this species suitable for beginners?
The difficulty level is shown at the top of this page. The Ant Keeping guide explains what to expect at each level.
What is included in a colony?
Each product describes what is included. Colony contents vary by species and product.
Can this species be shipped to my country?
Availability depends on your destination. See the shipping notes above and the shipping page.
Related Species
Other species from the Ant Atlas.
Messor barbarus
Harvester ant
A Mediterranean seed-harvester with one queen, around 10,000 workers and impressive trunk trails: straightforward and fascinating to watch.
- Origin
- Southern Europe and North Africa
- Difficulty
- Beginner level
- Type
- Harvester Ants
Ask about availability
Lasius niger
Black garden ant
One of Europe’s best-known ants and a popular first species: one queen, several thousand workers and a straightforward setup.
- Origin
- Europe
- Difficulty
- Beginner level
- Type
- Other Ants
Ask about availability
Atta cephalotes
Hairy-headed leafcutter ant
A leafcutter ant that grows its own fungus garden: a showpiece colony for experienced ant keepers, with millions of workers in nature.
- Origin
- Central and South America
- Difficulty
- Advanced level
- Type
- Leafcutter Ants
Currently unavailable
Related guides
Messor structor Care Guide: The European Harvester Ant
Messor structor care guide: seeds, nest, temperature, winter rest and colony growth for this polygynous European harvester ant, with identification notes.
Harvester Ant Care: Keeping Messor Colonies
Harvester ant care for beginners: seeds, nest setup with a dry seed store, temperature, winter rest and what to expect from Messor colonies.
Messor structor vs Messor barbarus: Which European Harvester Ant?
Messor structor and Messor barbarus compared: queens, colony size, worker size, temperature, winter rest and which harvester ant suits you.
Sources and further reading
- Wikipedia: Messor structor en.wikipedia.org/wiki/Messor_structor
- Schlick-Steiner et al. (2006). More than one species of Messor harvester ants (Hymenoptera: Formicidae) in Central Europe. European Journal of Entomology 103(2): 469–476.
- Quality Ants: Messor structor qualityants.nl/en/ants/messor-structor/
- AntScout: Messor structor antscout.com/species/messor-structor
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Images are AI-generated illustrations, not identification photographs.