Species comparison

Messor capitatus vs Messor ibericus

Side by side: difficulty, size, growth, climate, hibernation and nuptial flights, from the data and sources of each species sheet.

Head to head

Messor capitatus and Messor ibericus compared fact by fact
Messor capitatusMessor ibericus
Keeping
Difficulty
2/7

Beginner

2/7

Beginner

Escape risk
Low
Low
Diet
SeedsInsectsSugar
SeedsInsectsSugar
Best nests
Ytong nest · Acrylic nest · Naturalistic setup
Ytong nest · Sandwich nest · Acrylic nest
Colony
Growth
Fast
Fast
Colony size
Reaches 5,000 workers
Reaches 3,500 workers
Workers
4–8 mm

majors up to 13 mm

4–8 mm

majors up to 10 mm

Queen
13–15 mm
9–10 mm
Colony founding
Fully claustral

One queen

Fully claustral

One or more queens

Defense
Bites
Bites
Climate
Nest temperature
22–28 °C
22–28 °C
Nest humidity
50–60 %

Seed granaries: 30–50 %

40–60 %

Seed granaries: 30–50 %

Hibernation
10–15 °C

Dec – Feb

10–15 °C

Nov – Feb

Nuptial flights
Sep – Nov

After rain

Apr – Jun
Native range
Europe, North Africa
Europe

Size to scale

  • Messor capitatus

    Workers · 4–8 mm
    Majors · ≤ 13 mm
    Queen · 13–15 mm

  • Messor ibericus

    Workers · 4–8 mm
    Majors · ≤ 10 mm
    Queen · 9–10 mm
10 mm: both species are drawn at the same scale

Their year side by side

  • Messor capitatus : Hibernation: Dec – Feb, Nuptial flights: Sep – Nov

  • Messor ibericus : Hibernation: Nov – Feb, Nuptial flights: Apr – Jun

Months for temperate Europe and the Mediterranean. The weather decides the exact days, so flights can come earlier or later where you live.

How to tell them apart

Messor capitatus

Glossy, uniformly black workers of many sizes, with big-headed majors that walk slowly and clumsily. Unlike Messor barbarus, the majors have a black head instead of a red one and an angular rear of the thorax instead of a rounded one.

  • Tip Give the first workers small seeds such as dandelion or grass seeds, which even the smallest of them can crush on their own. The queen herself can help crack the harder seeds that the first workers cannot open yet.
  • Tip They share no liquid food mouth to mouth, so keep water and food available at all times. Cover the water spot with cotton or small stones, because the clumsy workers can drown in open water.

Messor ibericus

Reddish brown to dark brown workers of many sizes, with abundant hairs, duller than the glossy black Messor capitatus. It is a near twin of Messor structor: only a microscope shows its slightly shorter first antennal segment after the scape, and its queens are smaller, so around the Mediterranean the place it comes from is the best clue.

  • Tip A warm, fairly dry nest suits it. The team behind the 2025 Nature study kept 65 colonies in a room at 25 °C and 40% humidity and fed them grass seeds. Add a water tube or one damp corner, but keep the seed store dry, because seeds that get too damp sprout and the workers then carry them out.
  • Watch out A queen picked up next to a nest may never get started alone. In Italy, winged queens were seen waiting at the nest entrance instead of flying off, and keepers report that they mate on the ground, then go back into the nest or leave with a group of workers, and rarely found a colony alone. Collect a few workers with such a queen, or start from a colony that already has some.

More comparisons

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Messor capitatus sheet Messor ibericus sheet

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