Scientists track monarch butterfly migration with radio tags
Researchers are using tiny radio-frequency identification tags to map the cross-continental journeys of migrating monarchs.
What to know
- Researchers are using radio-frequency identification tags to map monarch butterfly migration routes across North America, with multiple organizations coordinating tagging efforts.
- Citizen scientists are creating distributed networks of pollinator gardens with milkweed along known migration paths to support the insects' journey.
- Technical concerns remain about whether the ~60 mg tags represent too heavy a burden for insects weighing ~600 mg during long-distance migration.
- Habitat pressures, particularly oleander aphid infestations in milkweed, are reducing monarch caterpillar populations in some areas along migration routes.
The dispute Whether the 60 mg tracking tags represent an acceptable research tool or a significant burden that could compromise the insects' survival during migration. · positions read across 10 posts and comments
Tracking technology and citizen gardening efforts represent an exciting conservation opportunity to support monarch migration.
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“That confirms that we are in good locations along normal flyways. My own property includes lots of antelope-horn milkweed and a couple other milkweeds. I found monarch caterpillars in my garden last wee…”
doodlebugging · Hacker News ↗
The tracking tags may impose a significant metabolic burden on butterflies during migration, raising questions about whether the research tool itself affects the insects' survival.
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“Even at 60 mg it's a significant additional burden for the butterfly, I'd expect. Even if you only take the heaviest Monarch butterflies that weigh in about 600 mg, it is 10% of their body weight.”
GeertB · Hacker News ↗
Environmental pressures like pest infestations and habitat loss are more pressing threats to monarch populations than the research infrastructure itself.
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“I'm on the monarch migration path and had wild milkweeds with monarch butterflies for a few years but the last 2-3 years oleander aphids exploded in population and I've seen a single caterpillar since.”
lovich · Hacker News ↗
Canadian Wildlife Federation Research communicatorBluMorpho Technology providerMonarch Watch / Monarch Research Research organizations
How it unfolded 6 developments, newest first · click a bar or a number to jump articlespostscomments
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Community questions safety of tags for predators
A commenter raises a question about whether the radio tags are safe if consumed by birds or other predators that eat tagged monarchs.
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An Omaha, Nebraska monarch-stop reporting in.The wife planted one this year. (Registered, got a little placard to place on a stake.)We saw a dozen or so cocoons appear around her garden—on plants, on the trim of our house. And then we saw them empty out. The skies too around the neighborhood were frequented by monarchs last month—we'd see them all…
1 more of the top 2 · 2 posts in this stretch
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What happens when a bird or predator eats the Monarch? Are these tags safe for animal consumption?
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Citizen gardeners report success creating migration "fuel stations"
A commenter describes how family members scattered across Arkansas, Oklahoma, and Texas have planted pollinator gardens with milkweed, confirming through the tracking study that their properties align with known monarch flyways and successfully attracted caterpillars.
“That confirms that we are in good locations along normal flyways. My own property includes lots of antelope-horn milkweed and a couple other milkweeds. I found monarch caterpillars in my garden last wee…”
— doodlebugging -
Several of my family members and I have planted pollinator gardens in the hopes that we can provide fuel stations for all the migrating insects and birds. Since we are kinda scattered from hell to breakfast we ended up with small to large spaces available scattered across several states including Arkansas, Oklahoma, and Texas. It is great to see…
2 more of the top 3 · 3 posts in this stretch
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Monarchs never really stop impressing. The journey they make cross-generational I think is just one of those marvels of nature that never fails to blow my mind.Has anyone gone down to their nesting location in Mexico? It's on my bucket list but I hear that as their numbers dwindle, it's a harder thing to experience.
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I love that your family has basically created a distributed network of little rest stops across several states. And the meadowlark story is wonderful
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Researcher flags concern about tag weight burden on insects
A commenter raises a technical concern that the tracking tags, even at 60 milligrams, represent approximately 10% of a monarch butterfly's body weight—equivalent to a 6 kg backpack on a 60 kg human—potentially significant for insects undertaking long-distance migration.
“Even at 60 mg it's a significant additional burden for the butterfly, I'd expect. Even if you only take the heaviest Monarch butterflies that weigh in about 600 mg, it is 10% of their body weight.”
— GeertB -
The article made it seem that the tags way on the order of half a gram, but that would be about the butterfly's weight. Even at 60 mg it's a significant additional burden for the butterfly, I'd expect. Even if you only take the heaviest Monarch butterflies that weigh in about 600 mg, it is 10% of their body weight. Like an 6 kg backpack for a…
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Community expresses wonder at monarch migration scale
Commenters marvel at the distance monarchs travel without stopping, with one noting the remarkable 60-70 mile crossing of Lake Michigan, and others expressing awe at the cross-generational nature of the migration.
“It's amazing that they can cross Lake Michigan without stopping. It looks like 60-70 miles. What a cool project.”
— dj_gitmo -
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Citizen scientists report observations along migration route
Commenters share personal reports of monarch activity and challenges. One reports that oleander aphids have devastated local wild milkweed populations over the past 2-3 years, eliminating caterpillars from their property despite being on a known migration path.
“I'm on the monarch migration path and had wild milkweeds with monarch butterflies for a few years but the last 2-3 years oleander aphids exploded in population and I've seen a single caterpillar since.”
— lovich -
The site looks like it got hugged to death.I’m on the monarch migration path and had wild milkweeds with monarch butterflies for a few years but the last 2-3 years oleander aphids exploded in population and I’ve seen a single caterpillar since.Are there ways to mitigate that while not killing the monarchs or am I just shit out of luck?
1 more of the top 2 · 2 posts in this stretch
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It’s amazing that they can cross Lake Michigan without stopping. It looks like 60-70 miles. What a cool project.
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HN community shares monarch tagging resources
The study gains attention on Hacker News, with readers sharing links to tracking tag technology, research organizations, and related projects tracking monarch migration.
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1 outlet Radio-tagged Monarch butterflies
first by HN Frontpage, 11d ago
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A lot comes up when you search for the BluMorpho tags. Some random links:https://celltracktech.com/pages/blumorphohttps://monarchresearch.org/news-and-events/monarch-research...https://www.cbc.ca/news/canada/new-brunswick/track-monarch-b...https://www.opb.org/article/2026/09/21/pacific-northwest-mon...A little pdf guide…
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background
Research blog covers radio-tagged monarch tracking study — A blog post by the Canadian Wildlife Federation documents a project using radio-frequency identification tags on monarch butterflies to track their migration patterns. The tags are produced by BluMorpho and multiple organizations are involved in the tracking effort.
What people are saying 0 voices from 0 sites · best of 10 · verbatim
- Are the radio-frequency identification tags safe if eaten by predators, and could this create secondary toxicity concerns?
- What methods can citizen gardeners use to protect milkweed plants from oleander aphid infestations without harming monarchs?