Caterpillar Life Cycle – Common Habits & Stages of Development

Caterpillars are some of the most bizarre-looking creatures on earth, famous for their remarkable transformation into butterflies or moths. But what is your knowledge about these amazing creatures and the caterpillar life cycle?

Teachers and students: you’re welcome to use this diagram in lessons and projects with credit to Learn About Nature.

Exploring the developmental stages of the caterpillar life cycle is one of the ways to understand more about our amazing nature. Caterpillars are a type of butterfly or moth larva that looks like worms and is frequently vividly colored, hairy, and warm-looking. However, without knowing the species, it is incredibly difficult to predict whether a caterpillar will become a moth or a butterfly in the future.

In this article, we will go into greater detail regarding the caterpillar life cycle, development, and metamorphosis.

What Are the Stages of the Caterpillar Life Cycle?

A caterpillar’s life cycle has four stages: egg, larva (the caterpillar), pupa and adult butterfly or moth. The egg hatches in a few days, the caterpillar eats and molts four or five times over two to five weeks, then it pupates and emerges as a winged adult that mates and lays eggs.

4 Stages of Caterpillar Life Cycle

The metamorphosis process is how the butterfly and moth grow. The Greek term “metamorphosis” translates as a transformation or physical change. There are four phases in the entire metamorphosis process for butterflies and moths: the egg, the larva, also referred to as a caterpillar, the pupa, and the adult stages.

1. Egg Stage

The egg stage is the first stage where the caterpillar life cycle starts. On plants, the mature female butterfly lays her eggs. Inside these tiny eggs, caterpillars grow. Depending on the species, the eggs can vary in shape and texture. The time it takes for the eggs to hatch can also vary depending on the species.

The embryo develops quickly inside the egg, and the caterpillar that hatches plays an important role in the whole cycle. However, the appearance and function of the caterpillar and the adult in Lepidoptera typically differ significantly.

In the beginning, the eggs hatch into a very small caterpillar. Most caterpillars eat eggshells as their first meal. During the process, the caterpillar will multiply its body mass thousands of times before starting to pupate.

2.  Feeding Stage

Why is the caterpillar life cycle important? The caterpillar’s job is to continuously consume food and grow. As mentioned before, the caterpillar splits its skin as it grows and sheds it around four or five times. Interestingly, the food consumed at this age is saved for use as an adult. 

During this stage, caterpillars can expand 100 times their original size. A monarch butterfly egg, for instance, is about the size of a pinhead, and the caterpillar it produces isn’t much larger. But after a few weeks, it will reach a maximum length of 2 inches.

Different butterfly species have different numbers of instars. In its fifth instar, the caterpillar will soon pupate, or molt, one more time to become a chrysalis. Depending on the species and the development circumstances, the butterfly spends a total of 2 to 5 weeks as a caterpillar.

Given the high mortality rates, it is thought that the caterpillar stage of a butterfly’s life cycle is the most hazardous. Weather, illness, parasites, and predators can all affect caterpillars. Only a small percentage of the hundreds of eggs laid by many adult butterfly species develop into butterflies.

3. Transition Stage

Another stage of the caterpillar life cycle is turning into a pupa. Usually, this happens when it is fully grown and stopped eating. The pupa may be buried underground, concealed in leaves, or hanging under a branch, depending on the species. Many moth pupae are enclosed in a silk cocoon for protection.

Although it may appear that nothing is happening, internal adjustments are taking place. In the larva, special cells were present, and they are currently dividing quickly. They will develop into the adult butterfly’s legs, wings, eyes, and other features. 

4. From Caterpillar To Butterfly

The majority of people see butterflies in their adult form when they think about them. They have very different characteristics from the larva. It was the caterpillar’s duty to eat. The adult’s duties include mating and egg-laying. 

While some adult moths don’t eat anything at all, most butterflies obtain their energy from flower nectar. The adult female may effortlessly fly from one location to another in search of the best plant for her eggs. Because caterpillars can’t go very far, this is significant.

The majority of mature butterflies only survive one or two weeks. However, certain species spend the winter hibernating. One of the things that makes rearing and viewing butterflies so much pleasure is how different each of the four stages is for various species of butterflies and how a worm-like caterpillar can turn out to be one of the most beautiful creatures of nature. 

The Caterpillar Life Cycle Summary

Now let’s sum up the major points of the caterpillar life cycle:

1. Once the caterpillar leaves its egg home and enters the big outside world they eat its way out of the egg and immediately starts chomping on the leaves of the host plant.
2. As the caterpillar grows, its skin gets too tight and cracks open, revealing a new, bigger skin below. During this stage, they shed their skin four to five times.
3. When the caterpillar is fully grown, it transforms into a “pupa,” a type of receptacle in which it transforms into a butterfly. They often do this near the host plant on twigs or in secure, covert locations. Depending on the species, the “pupa” stage might last anywhere from a few weeks to months.
4. A toughened shell develops around the pupa during this period to shield it from predators and bad weather. The caterpillar’s tissue, limbs, and internal organs change within.

What Does The Caterpillar Look Like?

After reviewing the caterpillar life cycle, now let’s explore what they look like. One important thing to know here is that a caterpillar possesses an exoskeleton, which is like a human skeleton but is external to the body. During the caterpillar life cycle, it sheds or molts its exoskeleton a few times when it becomes too small. Caterpillars typically repeat this five times during the whole cycle. 

How do you spot caterpillars? Finding them isn’t difficult since they have very distinct characteristics. In fact, the caterpillar has tiny eyes, many stubby legs, and antennae. The adults have large legs, long antennae, and complex looks. They can fly well because of their large, colorful wings. Unlike caterpillars, adults no longer grow.

Developing caterpillars use instars. In other words, an instar is a term for this molting. Each instar’s growth can be tracked. It can also be used to describe the growth of a caterpillar. While the adult mostly reproduces and disperses, the caterpillar feeds and grows. It is during the pupal stage that the caterpillar changes into an adult moth or butterfly.

Generalists or Specialists?

Generalists and specialists are the two types of caterpillars. Generalists are not picky eaters; they will consume anything. But specialists only eat one kind of plant or plant family. They consume plants from the Antirrhinum and Linaria families of snapdragons and toadflax, and the Plantago and Ruellia families of acanthus.

On the leaf buds or the upper side of the host plant, the female buckeye deposits her eggs one at a time. Since it solely consumes milkweed, the monarch butterfly is a specialist.

What Eats Caterpillars?

Many creatures outside in the wild endanger the completion of the caterpillar life cycle. The predators of caterpillars are birds, ladybird beetles, yellow jackets, and human beings. However, they have some interesting self-defense skills that keep them safe from all predators most of the time.

Interesting Facts 

• Even though a caterpillar appears to have more than six legs, only the six that can be identified on its thorax are actual legs. 
• Caterpillars make silk through a hole on their lips known as the spinneret, which spews out liquid silk. The liquid silk transforms into silk as it comes into touch with the air.
• Caterpillars contain 4,000 muscles, compared to the human body’s 629 muscles. A single or two neurons are connected to each muscle.
• It makes sense why caterpillars come in a variety of hues and materials. It’s interesting to note that the plants that caterpillars consume can change their color. Consequently, they can nearly completely disappear by blending in with plant colors.
• It is hard to distinguish between male and female caterpillars. It is a result of their incomplete development. When they are inside a pupa, the development of their reproductive organs begins. This implies that caterpillars cannot reproduce or mate.
• Like many other pests, caterpillars have self-defense instincts. They are like uncontrollable devouring robots once they enter a garden. The primary purpose of caterpillars during this stage is to consume and develop bulk. However, farmers suffer unimaginable harm as a result of their greed.

Final Words

In conclusion, the larval stage of members of the order Lepidoptera is known as a caterpillar. Butterflies and moths are both members of the order Lepidoptera. Since it involves the processes of eating, molting, and metamorphosis, the caterpillar life cycle is a crucial stage in the development of butterflies or moths.

Throughout their lives, female adult butterflies must look for a spouse and appropriate plants to lay their eggs on to resume the butterfly life cycle. Observing the caterpillar life cycle can teach you more about the life cycle of a butterfly and all the other insects that are included in the order Lepidoptera. So, the next time you see a caterpillar, don’t kill it, since it may soon become a beautiful butterfly.

How Long Each Stage Lasts

The timing of each stage depends on the species and, above all, on temperature. Warm weather speeds development, while cool weather slows it down. The table below gives typical ranges for common garden butterflies such as the monarch and painted lady during summer.

Stage	What happens	Typical length
Egg	Embryo develops inside a tiny shell laid on a host plant	3 to 7 days
Larva (caterpillar)	Eats, grows and molts through about five instars	2 to 5 weeks
Pupa (chrysalis or cocoon)	Body is reorganized into the adult form	1 to 2 weeks (months if overwintering)
Adult	Feeds on nectar, mates and lays eggs	1 to 2 weeks for most; up to several months for some

Many species can pause their development during cold or dry seasons, a resting state called diapause. Some spend the winter as eggs, others as half-grown caterpillars or as pupae, and a few, like the mourning cloak and the late-summer generation of monarchs, survive the winter as adults. That is why the same species can take a few weeks to complete its life cycle in summer but most of a year in cooler regions.

Butterfly or Moth? Chrysalis vs. Cocoon

Both butterflies and moths go through the same four stages, but the pupa looks different, and this is one of the easiest ways to tell them apart once a caterpillar stops eating.

• Chrysalis: butterfly caterpillars molt one last time and the new hardened skin becomes the chrysalis. It is not spun from silk, though the caterpillar first spins a small silk pad to hang from.
• Cocoon: most moth caterpillars spin a silk case around themselves and then pupate inside it. Some add leaves, hairs or soil to the silk.
• Underground pupae: many moths, such as hornworm moths, burrow into the soil and pupate in a small chamber with no cocoon at all.
• Adults: butterflies usually fly by day and have club-tipped antennae; most moths fly at night and have feathery or thread-like antennae.

Because the caterpillars themselves can look very similar, waiting to see how the insect pupates is often the simplest clue for young observers.

How Caterpillars Defend Themselves

Caterpillars are soft, slow and full of nutrients, so they are hunted by birds, wasps, beetles, spiders and many other animals. To survive long enough to pupate, different species use very different tricks.

• Camouflage: many are green or brown to match leaves and twigs. Some inchworms hold themselves stiff to look like a stick.
• Disguise: young swallowtail caterpillars look like bird droppings, which few predators want to eat.
• Eyespots: some swell their front end to show false eyes that make them look like a small snake.
• Warning colors: bright stripes, like the monarch’s yellow, black and white bands, warn that the caterpillar tastes bad. Monarchs store toxins from the milkweed they eat.
• Hairs and spines: bristles make them hard to swallow, and a few species have stinging hairs that can irritate human skin.
• Osmeterium: swallowtail caterpillars can push out a forked orange organ that releases a strong smell.

Because some hairy caterpillars can cause rashes, it is best to watch them rather than pick them up with bare hands.

How to Watch the Life Cycle at Home

Seeing metamorphosis up close is one of the best ways to learn about it. You can raise caterpillars from a kit or collect one carefully from a garden plant.

• Note which plant the caterpillar was eating. Most species will only eat their own host plant, so collect fresh leaves of the same kind.
• Keep it in a ventilated container, such as a mesh cage or a jar covered with fine cloth, out of direct sunlight.
• Give fresh, unsprayed leaves every day and remove old leaves and droppings (called frass) to prevent mold.
• Leave a twig or the lid free so the caterpillar has a place to hang or attach when it pupates. Do not touch the pupa while it hardens.
• When the adult emerges, let it hang for a few hours while its wings expand and dry, then release it near flowers on a warm day.

Only release butterflies or moths that are native to your area, and release them where you found the caterpillar if possible.

Caterpillar/Butterfly Life Cycle for Kids

1. Egg: A butterfly lays tiny eggs on the right food plant.
2. Larva: The caterpillar hatches, eats lots of leaves and molts as it grows.
3. Pupa: The caterpillar forms a chrysalis, and its body changes inside.
4. Adult: A butterfly comes out, dries its wings and flies away.

Key words: metamorphosis – a big change in body shape as an animal grows; chrysalis – the hard case a butterfly pupa forms; larva – the young, worm-like stage of some insects.

Try this activity: Raise painted lady caterpillars from a school kit in a mesh habitat. Keep a diary drawing each stage, then release the butterflies outside on a warm day if they are native to your area.

Free printable: Download the Caterpillar/Butterfly life cycle worksheet (PDF) – put the stages in order, match key words, draw and explain. Answer key included.

Caterpillar Life Cycle FAQs