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Warmer temperatures may make monarchs more vulnerable (Level A1) — butterfly emerging from a cocoon on a green leaf close-up photography

Warmer temperatures may make monarchs more vulnerableCEFR A1

21 Jan 2026

LevelA1
A2
B1
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Adapted from Leigh Hataway U. Georgia, Futurity • CC BY 4.0

Photo by Bankim Desai, Unsplash

Level A1 – Beginner
2 min
66 words
  • Monarch butterflies can get a parasite.
  • The parasite can make them weak.
  • Higher temperatures may make them more vulnerable.
  • Infections have more than tripled since 2002.
  • People plant milkweed to help monarchs.
  • Many people plant nonnative tropical milkweed.
  • Tropical milkweed can grow all year.
  • This can cause monarchs to delay migration.
  • When butterflies stay, parasites get more time to spread.
  • Warmer temperatures can reduce milkweed protection.

Difficult words

  • parasite — organism that lives on another animal
    parasites
  • vulnerable — easy to be harmed or hurt
  • infection — disease caused by a germ or parasite
    Infections
  • milkweed — a plant that monarchs use for food
  • migration — seasonal movement from one place to another
  • tropical — from warm regions near the equator

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever seen a monarch butterfly?
  • Would you plant milkweed to help monarchs?
  • Do any plants grow all year where you live?

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