Ant Life Cycle Explained: Egg, Larva, Pupa and Adult

Every ant you see began life as an egg. It didn’t hatch with six legs and a job to do. It went through several very different stages, tucked away in the nest and looked after by its mother or other ants. Knowing those stages explains a surprising amount of ant-keeping behaviour.

The short answer is that an individual ant has four stages: egg, larva, pupa, adult. This is called complete metamorphosis. A colony has a longer story, in which a queen starts a nest, raises workers, builds a working society and, if conditions allow, eventually produces new reproductive ants. These are two connected life cycles, and they aren’t the same thing.

This guide follows both, with examples from familiar British ants such as Lasius niger and Lasius flavus. Where an explanation varies between species, I’ll say so, not give you a tidy rule that isn’t true.

The four stages of an ant’s life

  1. Egg. The developing embryo is enclosed in a tiny egg.
  2. Larva. A soft, usually legless youngster hatches and grows by feeding and moulting.
  3. Pupa. The body is rebuilt into its adult form. Some pupae are wrapped in cocoons and some aren’t.
  4. Adult. A worker, queen or male emerges. Its outer skeleton finishes hardening, but it doesn’t grow larger through further moults.

This is also called holometaboly, and it’s very different from the development of insects like grasshoppers, whose young look like smaller adults. A newly hatched ant larva looks nothing like the ant you’d see crossing the patio.

Keepers use the word brood for the eggs, larvae and pupae together. Seeing all three in a colony usually means the queen has been laying over a period of time, not producing everything at once.

Stage 1: the egg

Ant eggs are tiny, pale and oval or slightly elongated. In a small colony you may first notice a cluster of little grains beside the queen. They’re hard to tell apart by eye, especially when they’re being moved around. Workers often gather the eggs and carry them to the part of the nest that suits development, because conditions inside a nest are far from uniform.

Not every egg becomes an ant. Some fail to develop, some are eaten, and certain species lay trophic eggs that are made to be food. A keeper can’t predict future worker numbers by counting every pale object in the brood pile.

Does a queen need to mate to lay eggs?

No. In the usual ant system, unfertilised eggs develop into males and fertilised eggs into females, so an unmated queen can lay eggs, but those eggs will normally become males. Workers and queens are both female, and being female doesn’t automatically mean becoming a queen. There are exceptions and more complicated reproductive systems among ants, so treat this as a good starting explanation and not a law. It also means that finding eggs isn’t proof that a newly caught queen has mated. If you aren’t sure the ant you’ve found is a queen at all, start with our queen ant identification guide.

Stage 2: the larva

When an egg hatches, a larva emerges. It’s soft-bodied, usually pale and has no walking legs or adult-style eyes. Depending on the species it may be curved, grub-like or unlike anything a beginner expects an ant to look like.

Most of the growing happens here. In many species adults feed larvae directly, though the details vary. Some larvae are fed prepared liquid, some can take solid pieces, and in some species larvae help process food for the colony. Workers aren’t just guarding a pile of eggs. They’re looking after hungry young.

As a larva grows it sheds its outer covering in a moult, and each growth period between moults is an instar. A 2010 research review reported three to five instars for the species studied, but noted that the number had been determined for just 64 ant species at that time. This is a historical figure, not a current total, and you can’t count instars from a glance into a test tube. The same study found three in Monomorium floricola.

Nutrition and caste

Larvae need suitable food to grow, and in many species food availability affects growth and which female larvae become workers or queens. That doesn’t mean there’s one special food that turns a worker into a queen. Nutrition, hormones, colony conditions and in some species genetics and maternal effects all interact, and their relative importance differs between ants. Once an individual has developed into an adult worker, extra protein won’t turn it into a queen. For the practical feeding side, see our guide What Do Ants Eat?. The life cycle explains why developing brood needs resources, and that guide covers what a keeper can sensibly offer.

Stage 3: the pupa

After the final larval stage the ant becomes a pupa. A pupa doesn’t feed or grow like a larva. Inside it, the body is being rebuilt into the adult’s legs, antennae, jaws and other structures.

Some ants spin a silk cocoon round the pupa before this stage, and others don’t. Formicine ants such as Lasius generally do, and the small tan or brown cocoons are often mistaken for seeds or eggs by new keepers. Myrmicine ants, including Myrmica, don’t spin cocoons, and their pupae are bare, with the legs and antennae folded visibly against the body. The pattern isn’t absolute. Some formicine genera don’t spin, and in a few species cocooned and naked pupae occur in the same nest. A bare white pupa isn’t automatically a sign that something is wrong.

Cocoons can also offer some protection. In experiments involving several ant species and a fungal pathogen, fungal growth was found less often on cocooned pupae than on naked pupae or larvae. However, some cocooned pupae still developed fungal growth, so a cocoon is not a guarantee against infection. A naked pupa can be perfectly normal for its species; the research does not suggest that keepers need to add nesting material to make larvae spin cocoons.

Stage 4: the adult

When development is complete, the adult emerges. A newly emerged worker is often noticeably pale and is called a callow. Its cuticle is still hardening and darkening. A pale new worker isn’t a different species, a permanently white ant or necessarily unwell, and its colour will change over its first days. In cocoon-forming species, other workers may help it out of the cocoon.

Unlike the larva, an adult ant doesn’t keep growing by moulting. A small worker stays a small worker. That matters for the first generation in a new colony. Later workers may be bigger, but the first tiny ones haven’t failed to finish growing.

Workers often start with tasks closer to the brood and spend more time foraging later, but jobs are flexible. Age, colony needs, experience and individual differences all play a part, and ants don’t follow a rigid timetable. To understand the head, mesosoma, waist and gaster of a fully formed ant, see our Ant Anatomy Explained guide.

How long does an ant take to develop?

There isn’t one reliable number for all ants. Depending on the species and conditions, development can take several weeks or run to months. Published experiments use particular populations, constant temperatures and controlled diets, so their results aren’t a universal countdown for your nest. Four things make the biggest practical difference:

  • Species. Lasius niger, Myrmica rubra and Camponotus don’t develop at the same speed.
  • Temperature. Within a species’ suitable range, development speeds up as it gets warmer. Too much heat can harm or kill brood, so faster isn’t better.
  • Food and colony resources. Larvae need adequate nutrition, and a tiny founding colony has very different resources from an established one.
  • Season. A temperate species may slow or pause development for part of the year.

Even within one colony, the stages don’t last equally long, so you can’t assume a fixed number of days for each.

What about common British ants?

Lasius niger is a well-studied example. Controlled research on founding queens shows that first-brood development and success depend on temperature, with differences between populations from different latitudes. Hobbyist care sheets sometimes offer a simple timetable, but that is not a reliable countdown for a particular queen. I wouldn’t promise a newly founded colony a date for its first workers, and warmer isn’t always better.

Lasius flavus lives mostly underground, so its brood timing should be read in the light of its nesting habits and the season, not copied from a black garden ant timetable. For non-native species commonly kept in Britain, such as Messor barbarus or Camponotus nicobarensis, use species-specific information. A development-time chart full of neat day counts can look helpful while being misleading, so I’d rather give you a broad, honest picture.

The second life cycle: from one queen to an established colony

So far we’ve followed one ant from egg to adult. Watch a colony over years, though, and a different cycle emerges: a new queen must establish a nest, raise the first workers and keep the colony going long enough to produce the next generation of reproductive ants.

1. Reproductive ants leave their colony

Established colonies of many species eventually produce winged reproductive females and males, called alates. In British black garden ants, mating flights are commonly seen in summer, but there’s no single national Flying Ant Day, since local conditions and species matter. Our Flying Ant Day UK guide covers the season.

2. A queen mates and finds somewhere to begin

After mating, a queen may shed her wings and search for a nest site. She can store sperm in a specialised organ and use it over a long reproductive life. Wing loss alone doesn’t prove mating, and many queens never succeed in founding a colony. Species found colonies in different ways:

  • Fully claustral founding. The queen seals herself in a chamber and raises her first brood from her own stored reserves. This is familiar in Lasius niger.
  • Semi-claustral founding. The queen has to leave to forage while raising her first brood.
  • Dependent or socially parasitic founding. The queen relies on existing workers or a host colony. Some British Lasius species use this strategy.

That’s why advice to feed every freshly caught queen, or never to feed any founding queen, is equally unreliable until you know the species. Our guide to what to do after catching a queen ant covers the immediate practical steps.

3. The first workers arrive

The founding queen lays eggs, the larvae develop, the pupae complete metamorphosis and the first adults emerge. In many independently founding species these first workers are unusually small and are called nanitics. For a fully claustral queen, their arrival changes the colony’s situation, because they can start collecting food and looking after more brood while she carries on laying. Small early workers aren’t a sign of poor care. Their size is part of how a new colony copes with limited resources. See our guide Your First Workers Arrived for what this means in a test-tube setup.

4. The colony grows, but not at a steady rate

Worker numbers build over successive generations of brood, and more workers can feed and protect more larvae. At the same time workers die, weather changes, food supply fluctuates and colonies may pause production. Growth isn’t a straight line or a doubling every month. Some species grow gradually and others can build very large populations when conditions allow. Long-term studies of individually monitored harvester-ant colonies show that colony age and size are related in complicated, species-specific ways, which isn’t a forecast for any colony in captivity. Our guide How Ant Colonies Grow in Phases looks at what a keeper might see from founding onwards.

5. A mature colony may produce new reproductives

Once a colony is established, and depending on its biology and environment, it may invest in males and new reproductive females. This doesn’t happen at a universal worker count or on the colony’s first birthday. The reproductives disperse and mate, some females found new colonies, and the cycle starts again.

How do eggs become workers, queens or males?

These are two separate questions: what sex will the ant be, and what adult form and role will it develop?

In the usual system, fertilised eggs become females and unfertilised eggs become males. Most female offspring in a working colony become workers, and some become new queens. A queen and a worker are therefore normally two forms of female ant, not male and female versions of each other. What decides a female’s caste can involve larval feeding, hormones, social conditions and genetics. Research on the harvester ant Pogonomyrmex badius found nutritional, social and genetic contributions to caste and size, and comparative work across many species shows that the mechanisms are diverse. Any simple rule that a larva becomes a queen only because of one particular food leaves out most of the story.

Can workers lay eggs?

In many species they can, though usually only unfertilised eggs, which develop into males. In many ants, the queen’s presence and policing by nestmates limit worker reproduction, but this varies by species. In Temnothorax crassispinus, researchers found that workers in queenless subcolonies produced males, and that worker-produced larvae were accepted and reared when subcolonies reunited. Don’t assume that applies to every species. In a typical colony, workers don’t replace their queen by producing new mated queens.

How long do ants live?

The four stages lead to very different adult lives, and lifespan depends on species, sex, reproductive role and conditions.

  • Queens. Queens of some species can live for many years, and a few for more than 20. A 2025 review calculated a median of the maximum recorded queen lifespans of 7.9 years (range 0.9–20 years) across nine carefully selected species. That is not a typical queen lifespan, and the authors noted that long-lived species were likely under-represented.
  • Workers. In Lasius niger, worker lifespan is typically reported as one to two years, and in many other species it’s shorter.
  • Males. Their adult reproductive period is usually much shorter than a queen’s.

A laboratory study of Lasius niger found that workers raised in small, early-stage colonies were smaller and had a higher chance of survival than workers raised in larger, intermediate-sized colonies. So a small first worker isn’t necessarily short-lived.

The “28-year queen” record

You’ll often read that a black garden ant queen lived for nearly 29 years. A critical 2025 review traced this to an obituary of the amateur myrmecologist Hermann Appel. It says the queen was caught in August 1931 after the nuptial flight and kept until April 1950, and it describes this as 28¾ years. Those dates add up to about 18¾ years, so the figure doesn’t match its own source. Some queens are clearly very long-lived, but the record shouldn’t be quoted as a typical expectation, or even as a firm number.

A colony can contain a queen who’s years old alongside workers born only recently. It survives by continuously producing new adults and not by keeping the same workers.

What happens in winter?

Many temperate ants have seasonal patterns that affect egg-laying and brood development. Some enter diapause, a programmed period of reduced development or activity. Other slowing may simply be a direct response to lower temperatures. They’re related, but they aren’t the same thing. Depending on the species and its stage, a colony may carry brood through winter or pause some of its development, and British ants don’t all overwinter at the same stage. For keepers, the lesson is to match seasonal care to the actual species and not try to speed everything up with constant warmth. Our ant hibernation and diapause guide covers this in more detail.

What you’re seeing in a test tube or nest

If you’ve recently caught or acquired a queen, recognising the brood is more useful than checking a development countdown.

  • Eggs are the smallest, smooth, pale objects, often grouped together.
  • Larvae are typically curved, soft and grub-like, and differ in size because they’re at different points in growth.
  • Pupae may look like little pale ants with folded limbs, or may be hidden in silk cocoons.
  • Callows have emerged and can move but are paler than mature nestmates.

Observe more than you handle, and avoid opening the nest or exposing the brood to bright light. A stable, suitable setup matters more than measuring every larva daily. If workers move brood between warmer and cooler or drier and damper parts of the nest, that’s normal colony behaviour. Photographs can also mislead, because a small pupa may look like something else until you see it closely.

Putting the two cycles together

A single ant changes completely as it moves from egg through larva and pupa to adult. A colony changes too, but over many overlapping generations, as workers arrive, die and are replaced while the queen and the colony’s social structure carry on. Seen that way, a lot of things fall into place: why brood needs tending, why first workers are small, why colonies sometimes seem to pause, and why a thriving colony is about more than the size of its latest brood pile.

If you’ve found a queen, the next steps are to identify her with our queen ant identification guide and confirm the species with the British Ant Identification Guide.

Species-specific reading: Messor barbarus Care Guide — Seeds, Setup and Winter Rest.

For species-specific advice on founding, feeding, temperature, multiple queens and seasonal care, see our Camponotus nicobarensis care guide.

The Myrmica rubra care guide looks at seasonal larval development and overwintering brood.

Sources and further reading

These sources support the broad biology and the species-specific findings discussed. Results from one ant species should not automatically be applied to all ants.