This habit is doubtless of value, especially during hibernation or possibly during the summer lethargy or aestivation, the latter a habit which may be more general among these butterflies than is now supposed.
"Butterflies Worth Knowing"
Clarence M. Weed
The theory of the aestivation of the butterflies of this group will explain a good many points hitherto obscure in the life histories of the other species.
"Butterflies Worth Knowing"
Clarence M. Weed
The old man had a great deal to say about "aestivation," as he called it, in opposition, as one might say, to hibernation.
"The Complete PG Works of Oliver Wendell Holmes, Sr."
Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)