Sneaky Silk Moths
Last spring, the periodical cicadas emerged across eastern North America. Their vast numbers and short above-ground life spans inspired awe and irritation in humans—and made for good meals for birds and small mammals. Such snacks do not come without cost, however: Cicadas emit extremely loud shrieks when captured. Perhaps the pattern of the giant silk moth Citheronia azteca (right) evolved to resemble a cicada as a form of Batesian mimicry—imitation by a nonpoisonous species of a poisonous or unappetizing one. So Philip Howse speculates in Giant Silkmoths: Colour, Mimicry and Camouflage (Papadakis, $40 paper), in which he and photographer Kirby Wolfe showcase these members of the Saturniidae family.
Wolfe offers notes on collecting and raising silk moths. But the book’s wealth of photographs serves as collection enough: Viewing page after page of stunning moths from all over the world, I felt the guilty pleasure of seeing more of these creatures than one would ever normally encounter. Caterpillars are well represented also. The markings of the Titaea lemoulti caterpillar (at left, below) break up the shape of its body, making it harder for predators to see.
At left (top), a male Automeris egeus moth displays its eye spots. Many silk moths’ eye spots look eerily like owl eyes. But the mimicry may not offer as much protection as one might hope. Howse notes, “There are reports of large numbers of saturniid moth wings, including those of the luna moth (Actias luna), beneath an owl’s nest.”
Connect With Us:
A free daily summary of the latest news in scientific research. Each story is summarized concisely and linked directly to the original source for further reading.
An early peek at each new issue, with descriptions of feature articles, columns,
and more. Every other issue contains links to everything in the latest issue's table of contents.
News of book reviews published in
and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the
Update and Scientists' Nightstand issues, create an
online profile, then sign up in the
My AmSci area.