BioKIDS home

Kids' Inquiry of Diverse Species

butterflies and moths


What do they look like?

This page is about Moths and Butterflies in general. There is more information about the families of Butterflies on their separate pages. Because Moths are hard to identify, we are just giving this one page for all Moth species.

Moth and Butterfly larvae (caterpillars) look fairly similar. They have long soft bodies, sometimes protected with spikes or hairs, and a head with chewing mouthparts. They have six jointed legs and then 1 to 5 (depending on group) pairs of soft unjointed legs called prolegs. Butterfly caterpillars always have 5 pairs of prolegs and are covered with fine hairs. Moth caterpillars may have either 5 pairs or prolegs (often fewer) or hairs, but not both. Most caterpillars are green or brown, and have color patterns that help camouflage them. Some caterpillars are poisonous or have toxic hairs or spines, and they often have bright warning colors to discourage predators from trying to eat them.

Adult Moths and Butterflies all have large wings that are covered with tiny scales. Each scale has a color, and together they give these insects their amazing wing patterns. No other insect groups have this coating of scales on their wings. Butterflies hold their wings up and down over their backs, while moths usually hold them folded down flat. Color patterns vary a lot, but like the caterpillars, they are usually either camouflaged or bright with warning colors.

All Butterflies and nearly all Moth species have special sucking mouthparts that coil up into a little spiral. No other insects have mouthparts that coil up this way. The bodies of these insects are soft, and covered with fine hairs. Butterflies tend to be longer and skinnier, with longer legs, and moths shorter and fatter with thicker hair, but this is not always true.

Butterflies and moths have large eyes and one pair of antennae. Butterfly antennae are thin with a thick section at the tip. Moth antennae are thin all the way to the end, or have lots of side branches so they look like feathers.

  • Sexual Dimorphism
  • female larger

Where do they live?

Moths and Butterflies are found all around the world. Some species live only in a small area, but many are found all across a continent. There are more than 12,000 species of moths and butterflies known just in the U.S., and probably more than 2,000 species in Michigan. The butterflies are well known, there are 146 species in Michigan, but the moths are not as well-studied. There are many small species that are still unknown to science.

What kind of habitat do they need?

Moths and butterflies usually stay close to the food plants used by their young. However, there are so many kinds of moths, and they eat so many kinds of plants and plant parts, that different species can be found in almost all land habitats. Moth and butterfly caterpillars are usually found on or near their food. The adults are usually nearby, except for a few species that migrate to avoid harsh climates.

How do they grow?

Moths and butterflies have complete metamorphosis. Adult females lay eggs, and the young that emerge from these eggs are worm-like larvae called caterpillars. The caterpillars eat and grow fast, and eventually they stop feeding and transform into a pupa, a resting stage that cannot move or feed. Often the caterpillar makes a cocoon to protect it before it transforms. Pupae that do not make a cocoon are called chrysalids. Inside the pupal case the moth or butterfly completes its transformation and emerges as a winged adult.

How do they reproduce?

Adult females mate, and soon after they start to lay hundreds of eggs. They usually lay their eggs on the particular food plant that their young will eat. Sometimes they leave a scent mark on the plant to tell other females that they have already laid eggs there. This way they avoid having too much competition for food between their offspring.

  • Breeding season
    Spring, Summer, Early Fall.

There is no parental care in butterflies or moths.

  • Parental Investment
  • no parental involvement

How long do they live?

Most species live only one year. A few live to two or three years, and some only live for a few months. Most species spend the winter as eggs or pupae, a few winter as caterpillars. Only a handful survive the winter as adults, most adults die when the first hard frosts come.

How do they behave?

Butterflies are active in the day, and most Moths fly at night. There are some moths that fly in the daylight though. Some Butterfly species, Monarchs and others, migrate south in the early fall to avoid winter cold.

How do they communicate with each other?

Butterflies use sight more, since they are active in the daylight. Some species have special courtship flights they use to make sure their mate is the right species, and healthy.

Moths use chemical senses more to find each other in the dark. Some male moths can smell a single female from kilometers away.

What do they eat?

Most moths and nearly all butterfly caterpillars eat the leaves and flowers of plants. Some moth caterpillars eat fruit, or seeds, and a few eat animal foods like beeswax or fur. A very few species of caterpillars are carnivores, eating aphids or other soft-bodied insects.

Adults mostly drink nectar or sap. They sometimes feed on mud to get minerals, or on animal dung to get protein that they need.

What eats them and how do they avoid being eaten?

Caterpillars hide and have camouflage, or they collect poisons from the plants they eat and hold them in their bodies. Poisonous caterpillars sometimes stay together in groups, and excrete toxic chemicals on any predators that attack them. If they are attacked they thrash around and try to bite their attacker, or play dead and drop to the ground. Some moth caterpillars have "safety lines" of silk: they drop down and hang on their silk line, then crawl back up after the predator is gone. Others build "tents" or hiding places from their silk, and stay inside when they are not eating.

Adult butterflies rely on camouflage and flight to avoid predators, and some (swallowtails and monarchs especially) are poisonous to predators. Some moths have ears that let them hear the sonar calls of bats. When they hear a bat, they quickly drop to the ground to get away. One family of moths have mostly clear wings and look like wasps, they fly in the daylight and act like stinging insects to fool their predators.

What roles do they have in the ecosystem?

Adults are sometimes valuable pollinators. Caterpillars can be major herbivores, and are food for lots of other animals.

  • Ecosystem Impact
  • pollinates
Species (or larger taxonomic groups) that are mutualists with this species
  • Ants (some caterpillars give honeydew like aphids)

Do they cause problems?

Some species of moths are major agricultural pests. Their caterpillars eat crop plants. Millions and millions of dollars are spent every year trying to protect our crops from these pests. Some get in stored food like grain, or eat wool and fur. A few caterpillars have poisonous hairs or spines that can cause a painful rash if you touch them.

  • Ways that these animals might be a problem for humans
  • crop pest
  • household pest

How do they interact with us?

Silk comes from the cocoons of a moth, and many people enjoy the beauty of butterflies and moths.

Are they endangered?

Some species are endangered, usually because the habitat they need or the food plant they eat is endangered.

  • IUCN Red List [Link]
    Not Evaluated



Living in Australia, New Zealand, Tasmania, New Guinea and associated islands.

World Map


living in sub-Saharan Africa (south of 30 degrees north) and Madagascar.

World Map


living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

World Map


living in the southern part of the New World. In other words, Central and South America.

World Map


living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.

World Map

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends.


a wetland area rich in accumulated plant material and with acidic soils surrounding a body of open water. Bogs have a flora dominated by sedges, heaths, and sphagnum.


an animal that mainly eats meat


mid-altitude coastal areas with mild, rainy winters and long, dry summers. Dominant plant types are dense, evergreen shrubs.

desert or dunes

in deserts low (less than 30 cm per year) and unpredictable rainfall results in landscapes dominated by plants and animals adapted to aridity. Vegetation is typically sparse, though spectacular blooms may occur following rain. Deserts can be cold or warm and daily temperates typically fluctuate. In dune areas vegetation is also sparse and conditions are dry. This is because sand does not hold water well so little is available to plants. In dunes near seas and oceans this is compounded by the influence of salt in the air and soil. Salt limits the ability of plants to take up water through their roots.

  1. active during the day, 2. lasting for one day.

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature


union of egg and spermatozoan


forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.


An animal that eats mainly plants or parts of plants.

internal fertilization

fertilization takes place within the female's body


referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.


offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).


marshes are wetland areas often dominated by grasses and reeds.


A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.


makes seasonal movements between breeding and wintering grounds


having the capacity to move from one place to another.


This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.

native range

the area in which the animal is naturally found, the region in which it is endemic.


active during the night

oceanic islands

islands that are not part of continental shelf areas, they are not, and have never been, connected to a continental land mass, most typically these are volcanic islands.


found in the oriental region of the world. In other words, India and southeast Asia.

World Map


reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.


the regions of the earth that surround the north and south poles, from the north pole to 60 degrees north and from the south pole to 60 degrees south.


Referring to a mating system in which a female mates with several males during one breeding season (compare polygynous).


"many forms." A species is polymorphic if its individuals can be divided into two or more easily recognized groups, based on structure, color, or other similar characteristics. The term only applies when the distinct groups can be found in the same area; graded or clinal variation throughout the range of a species (e.g. a north-to-south decrease in size) is not polymorphism. Polymorphic characteristics may be inherited because the differences have a genetic basis, or they may be the result of environmental influences. We do not consider sexual differences (i.e. sexual dimorphism), seasonal changes (e.g. change in fur color), or age-related changes to be polymorphic. Polymorphism in a local population can be an adaptation to prevent density-dependent predation, where predators preferentially prey on the most common morph.


rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Climbing plants are also abundant. There is plenty of moisture and rain, but may be somewhat seasonal.

scrub forest

scrub forests develop in areas that experience dry seasons.

seasonal breeding

breeding is confined to a particular season


reproduction that includes combining the genetic contribution of two individuals, a male and a female


associates with others of its species; forms social groups.


lives alone


a wetland area that may be permanently or intermittently covered in water, often dominated by woody vegetation.


this biome is characterized by large expanses of coniferous forest, there is an extended cold season and heavy snowfall.


that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).


Living on the ground.


defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement


the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.


A terrestrial biome found in very cold places -- either close to polar regions or high on mountains. Part of the soil stays frozen all year. Few kinds of plants grow here, and these are low mats or shrubs not trees. The growing season is short.

year-round breeding

breeding takes place throughout the year

University of Michigan Museum of ZoologyNational Science Foundation

BioKIDS home  |  Questions?  |  Animal Diversity Web  |  Cybertracker Tools

. "Lepidoptera" (On-line), Animal Diversity Web. Accessed April 16, 2014 at

BioKIDS is sponsored in part by the Interagency Education Research Initiative. It is a partnership of the University of Michigan School of Education, University of Michigan Museum of Zoology, and the Detroit Public Schools. This material is based upon work supported by the National Science Foundation under Grant DRL-0628151.
Copyright © 2002-2014, The Regents of the University of Michigan. All rights reserved.

University of Michigan