Overview

Ants are among the most numerous insects in the world, possessing remarkable survival and reproductive abilities and found in diverse habitats. They play a vital role in ecosystems, serving not only as a food source for other animals but also as a catalyst for soil health and plant growth. Ants are highly social, collaborating in their nests and engaging in complex social activities that give them an advantage in various competitive situations and are cultural symbols of diligence and solidarity.

Ants are "eusocial" insects with three important characteristics: division of labor in reproduction, overlapping generations, and cooperative care for immature individuals.

▋ Ants belong to the family Formicidae in the order Hymenoptera and are relatives of bees and wasps. However, only the reproductive caste (queen ants and drones) of ants have wings; the rest of the ants do not have the ability to fly.

Basic positioning
They are often in the same family as wasps, hornets and other insects, but their antennae are bent like knees and their waists are narrow, forming abdominal stalks, which are typical characteristics of ants.
Origin and diversity
The earliest ant fossils date back to the Cretaceous period and may have evolved from primitive wasps. Over 13,000 ant species have been discovered worldwide, with at least 300 recorded in Taiwan.
Distribution around the world
Ants are found everywhere except Antarctica and a few islands, and some studies estimate that they account for 15–251 TP3T of terrestrial animal biomass.

▋ Ant's Growth Cycle

Ants are holometabolous insects. From eggs to mature worker ants, they go through four stages: egg, larva, pupa, and adult. Each stage is crucial to the survival and reproduction of ants.

IMG 4043 Egg Cocoon — *Stages of ant development*

Egg ( Egg )

The starting point of an ant's life. The queen ant will lay eggs in a safe environment. The surface of the eggs is only a thin layer of chitin, which is very fragile.

The eggs are typically yellow, white, or beige in color and can be round, oval, or elongated. The egg stage lasts from a few days to a few weeks, and the larvae hatch after hatching.

Unlike other species, the fertilized eggs of ants will hatch into female ants (worker ants, soldier ants, queen ants, etc.), while the unfertilized eggs of ants will survive and develop normally and eventually hatch into male ants.

Larva ( Larva )

Ant larvae cannot survive on their own and rely on worker ants for food and protection.

▋ Ant larvae will undergo 5 moltings, and their body size will increase after each molting.

▋ The fourth instar larvae will have the ability to chew and digest solid food. Ant larvae also serve as the "organs" responsible for digestion within the ant colony.

Ant larvae are unable to move and have no eyes, nose or other senses other than their mouths. Their only goal is to continue eating.

Pupa Pupa | Cocoon

After consuming enough food and growing to maturity, the larvae undergo a final molt, then decompose and reassemble all the organs in their bodies and enter the pupal stage.

▋ The pupa is white and translucent, and has the appearance of an adult (such as antennae and mandibles). It will no longer eat at this stage.

▋ The larvae of some ant species have the ability to secrete silk threads. When they pupate, the larvae will secrete silk threads from their mouths to wrap themselves up, just like silkworms. This type of pupa is called a cocoon.

Ant pupae usually transform into adults after 1 to 3 weeks.

Adult Beetle ( Adult )

After maturing, the ants emerge from their cocoons and begin to move freely and contribute to the family.

*Adult Ants | Worker Ants | Scar-chested House Ants*

▋ Adult ants play different roles, depending on their gender and the needs of the ant colony. They may be workers, soldiers, or reproductive queens.

▋ The development process of ants

Egg
- Maintain for 3 to 10 days
Larva
- Maintain for 20 to 40 days
- Sheds skin 5 times during this period
pupa | cocoon
- Maintain for 5 to 15 days
- The use of silk thread to wrap oneself is called a cocoon
Adult Beetle
- Possibly worker ants, soldier ants, queen ants, or male ants

▋ Special Introduction

Complete metamorphosis
After going through the "pupa | cocoon" stage, the internal organs will dissolve and reorganize at this stage, and the appearance of the larvae and adults will be very different, such as ants and caterpillars.
- Incomplete metamorphosis: The larvae gradually grow into adults, and the two look similar, such as cockroaches.
feeding behavior
After worker ants obtain liquid food outside, they return to the nest and spit out the food to larvae or other adults, while also exchanging various chemical signals. This "mouth-to-mouth feeding" is scientifically known as TrophallaxisThe

▋ Ant Classes

In an ant colony, there are different classes, each class is responsible for different tasks, forming a strict and orderly division of labor and cooperation.

Main classes: worker ants, male ants, queen ants
- Queen:
  - The fertilized egg develops, has two sets of chromosomes (2n), and is dedicated to reproduction.
- Worker
  - They also come from fertilized eggs, but they are infertile. Females are responsible for nest building, feeding, guarding, etc.
- Male
  - Unfertilized eggs develop into a single set of chromosomes (n) and usually die after mating.
Soldier
Some species have soldier ants, whose specialized heads and mandibles are not just for defense; some also help crush hard food. They are also called "large worker ants."

Queen

Responsible for laying eggs and reproduction, has wings and is the largest in size.

▋ The queen ant has the ability to reproduce and fly. Depending on the system, there will be one to multiple queen ants in an ant nest. Each ant colony is established by the queen ant alone.

Depending on the size and species of the ant, the queen ant usually lives for 5 to 20 years and will continue to lay eggs during her lifetime.

*Tail-raising ants | Multiple queens building a nest | Single queen*

▋ The queen ant's job is to:

spawning
Nuptial flight (reproduction)

▋ The number of queens depends on:

single-post system
- Only 1 queen exists
- like:Giant mountain ant (Camponotus)
multiple posterior system (math.)
- Several (common) or dozens (rare) queens may exist at the same time
- like:Pheidole

Worker ant

They are responsible for the vast majority of work, are small in size, have no reproductive ability, and are the largest in number.

▋ In an ant colony, more than 95% of them are worker ants, who do almost all the work in the ant colony and keep the entire ant colony running.

The lifespan of worker ants depends on their size and species.Usually 3 to 12 monthsThe larger the worker ants, the longer their lifespan.

*Long-legged house ants | Worker ants | Carrying building materials for ant nests*

▋ The duties of a worker ant include:

Foraging
attack
defense
move place
Finding Resources
Cleaning ant nests
Caring for larvae
Throwing away garbage
discarded corpses
Feeding companions

Soldiers

They are larger than worker ants, usually have specialized head muscles, and are good at cutting food, attacking, and defending.

*Diverse oligotrophic ants | Soldier ants | Specialized head muscles*

Soldier ants need to consume a lot of food, so their number will not increase indefinitely. The number of soldier ants is usually"3 to 10 % of worker ants"The

▋ The work of soldier ants is limited to cutting food, attacking, and defending, but some ant species' soldier ants can also perform the work of worker ants, in which case they are calledMajor, not all ants have a soldier class.

*Thick-backed House Ant | Soldier Ant | Responsible for cutting seeds | Super-specialized head*

Soldier ants usually live longer than worker ants, usually 6 to 18 months.

▋ Soldiers' duties:

Cutting food
Attacking prey
Defense against intruders

▋ The job duties of a Major worker ant are:

The work of soldier ants
Worker ants' job duties

Male

The only male has wings, no mandibles, and no working ability; its lifespan is extremely short.

It looks like a mosquito; unlike an ant, it is black and brown in color and has the ability to fly. Its only job is to fly out of the ant nest during the mating season (mating season), find the queen ant and mate.

▋ Male ants will die shortly after mating. If they do not mate for a long time, their lifespan will only last for a few weeks.

Since male ants do not produce children, only ant colonies that have developed to a certain size will produce male ants around the mating season. Normally, there will be no male ants living in the ant nest.

▋ The job content of male ants:

copulation (esp. of animals)

▋ Further Reading | Nuptial Flight (Ant Mating Season)

Success Rate Less Than 1%, Mating Rituals of Ants: Wedding Flight | Super Detailed Introduction

▋ Ant's appearance

Body segments and geniculate antennae
The head, thorax, and abdomen are clearly separated. The thorax and abdomen usually connect to one or two waist segments (abdominal stalks), with the posterior segment called the abdominal sac. Most worker and soldier ants are wingless; only unmated females and males have wings.
Body size differences
Some ants can be as short as 0.75 mm or as large as 6 cm (fossil species) in the Archaeocene subfamily. Some extant giant ants, such as the bullet ant, can exceed 2.5 cm in length and have a very painful bite.

▋ Morphological and age polymorphism

Morph Polyethism
Refers to individuals in the same group who share different tasks due to their different body shapes and appearances, such as worker ants and soldier ants each performing their own duties.
Age Polyethism
Young worker ants are responsible for nest duties (caring for larvae and cleaning the environment), while older workers go out to forage, reducing the risk to the young ants. This "age-based division of labor" mechanism is seen in most ant species.

▋ Ants' communication and cooperation methods

Pheromone Path
Ants use pheromones to leave messages on the ground to guide their companions to food areas. Once the food is gone and the scent fades, the entire colony will move on.
Warning Pheromones
When a companion is injured or crushed, it often releases a strong signal to make other ants alert or gather together.
Tentacle function
The knee-shaped antennae can effectively detect chemical molecules, allowing ants to distinguish each other's status and health status.

▋ The role of ants in the ecosystem

Ants' contributions to soil and plants

loose soil
Nesting behavior aerates the soil and improves water retention.
Nutrient cycling
Ants decompose dead plants and animals, returning organic matter to the soil and promoting the biological cycle.
Seed dispersal
Some ants carry seeds and discard them outside the nest, allowing plants to grow over a wider area.

▋ Ants’ interactions with other organisms

Mutual benefit and symbiosis
Ants and aphids (or scale insects) form a "nurturing-honey-providing" relationship, where ants provide protection and aphids secrete sweet liquid.
Slavery and sojourning
Some ants steal pupae from other ants, allowing them to hatch and become slave workers. Others engage in "parasitic" queen ant behavior, infiltrating other ant nests and relying on their workers to raise their offspring.
Hunting and marching
Army ants have no fixed nests and prey on small animals and insects during their long migrations. Trap-jaw ants, on the other hand, can bite their prey with incredible speed, even ejecting themselves.

▋ Ant problems and prevention strategies in the home environment

Causes and Signs of Home Ant Infestation

Moisture and food triggers
When the kitchen or bathroom is damp, or there is debris on the floor, it often attracts Pharaoh ants, black-headed ants, etc.
Climate stimulus
Rain or temperature fluctuations can cause ants to invade indoors in search of shelter and food.
Ant Trail Observation
If there are regular paths of ants in corners or near windows, or if ants swarm around food, these are signs of an invasion.

Home ant prevention and ant extermination methods

Clear ant trails
Wipe down the path with soapy water or vinegar to destroy any pheromone residue.
Natural ant repellent
Substances with pungent smells, such as peppermint essential oil, citrus peels, and garlic, can help repel them.
Poison Bait Strategy
Mix boric acid or borax with sugar water to trick worker ants into bringing poison bait back to the nest, where the entire nest will be wiped out.
Watch out for invasive species
Stinging species such as the invasive fire ant (Solenopsis invicta) are more harmful to humans and pets and need to be handled with caution or professional help is sought.

▋ Introduction to common household ant species

Pharaoh Ant (Monomorium pharaonis)
It is small in size and yellowish-brown in color, and is often found in kitchen corners; poison bait is more effective in prevention and control.
Black-headed panic ant (Tapinoma melanocephalum)
The head is black and the belly is white. It moves very fast. Keeping the environment clean is the most important thing.
Carpenter ants
It is large in size and will eat away at wood to build its nest, so you need to pay attention to the moisture in the wooden structures in your home.

Interesting facts and technological inspirations about ants

▋ The Amazing Abilities and Interesting Facts of Ants

Loading and carrying
Literature mentions that ants can drag objects that are dozens of times their own weight, and there are even reports that they can carry objects that are more than 50 times heavier than themselves.
Group Organization
Army ants march in large groups, and leaf-cutter ants cultivate fungi on leaves, both demonstrating a collaborative model with sophisticated division of labor.

▋ Technological applications and research trends inspired by ants

Ant Colony Optimization
It imitates the path-finding mechanism of ants and is widely used in logistics, routing, scheduling and other fields.
Robot collaboration
Researchers have developed small autonomous swarm robots based on the team carrying model of ants to improve the efficiency of carrying or retrieval.

The symbolic meaning of ants in culture and art

▋ Diligence and Cooperation: The Cultural Image of Ants

Pet Keeping and Dueling Culture
Some people now raise ants to observe their social behavior. In ancient times, there was also the entertainment of "ant fighting", where people would cut off their antennae to enrage ants and watch the fight.

Ancient and modern documents
In ancient times, ants were called horse ants or horse ants. They were used as medicine or as a special food for emperors (蚳醢). In Aesop's Fables, ants often symbolize diligence and the spirit of preparing for a rainy day.

Edible and medicinal
The Dai people and parts of Mexico prepare ants or ant eggs into a sauce for consumption. Traditional Chinese medicine texts also believe that ants have the ability to replenish qi and prolong life.

Overview