Getting Started
Discover Butterflies
A gentle introduction to butterflies — what they are, how they live, and how to start noticing them — for anyone visiting this atlas for the first time.
Common Myth
Do butterflies live for only one day?
No — this is one of the most common myths about butterflies. Lifespan varies widely by species and by life stage.
The idea that butterflies live for just one day usually confuses the adult stage with the whole life cycle. A butterfly's life actually has four very different stages: egg, larva (caterpillar), pupa (chrysalis), and adult.
How long each stage lasts depends heavily on the species, the climate, and the time of year. In many species, the egg, larva, and pupa stages together last far longer than the adult stage.
As adults, some butterflies live only briefly, while others survive for several weeks, and some species even overwinter as adults. There is no single "one day" rule that applies to butterflies in general.
The four life stages
- 1
Egg
The butterfly begins as a tiny egg, usually laid on or near a plant the larva will be able to feed on.
- 2
Larva (caterpillar)
The larva hatches and feeds, growing and moulting several times before it is ready to pupate.
- 3
Pupa (chrysalis)
Inside the pupa, the caterpillar's body is reorganized into the adult form.
- 4
Adult
The adult butterfly emerges to feed, mate, and — for females — lay the eggs of the next generation.
Why butterflies matter
Butterflies are pollinators, a food source for other wildlife, and one of the most visible signs of a healthy environment.
As adults, many butterflies visit flowers for nectar, and in doing so help pollinate the plants they feed on.
Their caterpillars are an important food source for birds and other insects, linking butterflies into the wider food web.
Because butterflies are sensitive to changes in their habitat, their presence — or absence — is often used as a general signal of an ecosystem's health.
Butterfly life cycle
Butterflies undergo what biologists call complete metamorphosis — a four-stage life cycle in which the animal looks completely different at each stage.
Unlike insects such as grasshoppers, which simply grow larger versions of themselves, a butterfly's body is completely rebuilt between stages: egg, larva, pupa, and adult.
This transformation lets the larva and the adult specialize in very different roles — the caterpillar's role is to eat and grow, while the adult's role is to fly, find a mate, and reproduce.
Butterflies and moths
Butterflies and moths are close relatives, and the line between them is less clear-cut than most people assume.
Both belong to the insect order Lepidoptera, and butterflies are, in a scientific sense, simply one branch of the moth family tree.
Common rules of thumb — butterflies fly by day and moths by night, or butterflies have clubbed antennae while moths have feathery ones — hold true for many species but not all, so they're best treated as guides rather than strict rules.
Why butterflies are declining
Many butterfly populations are under pressure, and the causes are closely tied to how land and chemicals are used.
Loss and fragmentation of natural habitat — meadows, hedgerows, and open woodland — removes the plants that both caterpillars and adult butterflies depend on.
Pesticide and herbicide use can harm caterpillars directly, or remove the host and nectar plants they need.
A changing climate is shifting when flowers bloom and when butterflies emerge, which can put the two out of step with each other.
How to help butterflies
Small, local choices can make a real difference for butterflies.
Planting native, nectar-rich flowers and larval host plants gives butterflies food at every life stage.
Avoiding pesticides and herbicides where possible, even in a small garden or on a balcony, protects both caterpillars and the plants they need.
Leaving part of a garden or green space a little wild — with long grass, leaf litter, or native shrubs — gives butterflies places to shelter, pupate, and overwinter.
How to begin butterfly watching
Butterfly watching needs very little equipment to begin — mostly patience and a willingness to look closely.
Warm, sunny, relatively calm days are the best time to look, since butterflies are most active in good weather.
A basic field guide, or a photo-identification approach like the one this atlas aims to support, helps turn a sighting into a confirmed identification.
Meadows, forest edges, and gardens with flowering plants are reliable places to start looking, since butterflies follow their food.
Continue Exploring