THE ANIMAL FILES

Large white butterfly

Pieris brassicae

A cabbage leaf and a flower feed different stages.

The large white butterfly links white wings with a very different caterpillar. Its larvae eat plant leaves, while adults visit flowers for nectar. Egg placement, larval growth and bright warning colors show why a butterfly habitat cannot be judged by flowers alone.[1]

Follow the evidence ↓
Large white butterfly
Image: Didier Descouens · Commons · CC BY-SA 4.0
Young food
Leaves of cruciferous plants[1]
Adult food
Flower nectar[1]
Growth
Several larval instars separated by molts[1]

An egg placed for the next diner

The habitat includes open places, gardens and farms where host plants occur. Cabbages and other crucifers are useful to the developing caterpillars. An adult may fly between resources, but an egg cannot choose another plant after it is laid. The location selected by the female therefore connects adult behavior to the food available after hatching.[1]

Growth comes in stages

Caterpillars pass through successive instars, with molts between them. Size, activity and markings change as development proceeds. The feeding stage is not simply a miniature adult waiting to acquire wings: it has its own body form and food requirements. Comparing caterpillars means considering age as well as appearance.[1]

Visible does not mean undefended

Bright larval colours act as warning signals associated with chemical defences from food plants. A predator may learn that a conspicuous animal is unpalatable. This is a different strategy from blending into a leaf. Visibility can carry information, so a brightly colored caterpillar is not automatically failing at avoiding predators.[1]

A COMMON MIX-UP

Do caterpillars and adults eat the same part of a plant?

No. Caterpillars feed on foliage while adults take nectar. A life cycle can connect distinct plant resources.[1]

TRY A LITTLE REASONING

Could a flower-rich garden still lack what its caterpillars need?

Reveal the explanation

Yes. Nectar for adults does not replace suitable host leaves for larvae. Both stages matter when assessing the habitat.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Pieris brassicae (adapted and translated; exact revision)
  2. NCBI Taxonomy — Pieris brassicae (identity and game lineage)

Last fact check:

One discovery leads to another

Monarch butterflyOne migration route can take more than one generation to complete.Danaus plexippus ↗Red admiralOne butterfly carries both a bright display and a brown marbled underside.Vanessa atalanta ↗Old World swallowtailA swallowtail caterpillar changes disguise as it grows.Papilio machaon ↗