Study
Navigational mechanisms of migrating monarch butterflies
Reppert, Steven M.; Gegear, Robert J.; Merlin, Christine
Trends in Neurosciences, 2010
A synthesis of flight-simulator and field work on how monarch butterflies orient during their multi-generational migration, covering the sun compass, its circadian time-compensation, and the antennal clock.
- Studied in
- Danaus plexippus
- Sample size
- review of monarch navigation experiments
Monarchs use a time-compensated sun compass whose clock sits in the antennae rather than the brain; removing or painting the antennae disrupts orientation while leaving flight intact.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Monarch orientation depends on a sun compass calibrated by a peripheral circadian clock located in the antennae.
How NatureHQ reads it
The antennal clock is the detail worth carrying: the timekeeping a sun compass needs turned out to sit in a sensory appendage, not centrally, which is not how a vertebrate would do it. The migration is also multi-generational — no individual completes the round trip — so whatever guides it cannot be individual memory.
- A review rather than a single experiment.
- Flight simulators measure intended heading, not achieved navigation.
- How monarchs locate the specific overwintering sites remains unexplained.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Animal navigation
Navigating animals use several overlapping compasses, not a single magic sense
Monarch butterfly
The clock a monarch uses to correct for the moving sun is not in its brain. It is in its antennae, and painting them black stops the compass working.
Monarch butterfly
The butterflies that arrive in Mexico are the great-grandchildren of the ones that left it. No monarch makes the round trip, so none of them can be remembering the way.
Published by: Cell PressPublished in a Cell Press journal.
doi.org/10.1016/j.tins.2010.04.004
Checked against Crossref and OpenAlex on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-09.