One of Nature’s Mysteries to Solve

Hey there!

Mystery #158

Maybe you know what kind of butterfly it is, but is it a male or a female, and how can you tell?

I’ll check back later for your guesses!

~~~

We had correct guesses today! I’m chasing my tail in excitement that so many of you humans leaped in to guess!

Yes, this is a Monarch butterfly, and it’s a…male. The thin veins and the two black spots on the hind wing identify it as a male. Those black spots are scent-producing organs. They are actually tiny pouches, containing scent scales or ‘androconia’, the term entomologists use meaning ‘male dust’. It’s where they produce their pheromones to attract the females.

For comparison, here’s a female Monarch laying eggs.

Monarch female laying eggs

Her hind wings have wider bands of black scales. But here’s the tricky part–you can see the veins on either side of the hind wings, but the scent pouches on the male are only visible from the top of the wings!

So good luck identifying your Monarchs, you quick-eyed humans!

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