I have written about the aestivation of land snails during the hot and dry Mediterranean summers. My recent trip in western Turkey gave me new opportunities to observe and photograph dormant snails. These are Albinaria caerulea, one of the 3 species of Albinaria present around the town of Kuşadasi (Read this paper of mine for more info).
One characteristic of A. caerulea is their tendency to aestivate in groups, usually stuck to each others’ shells. Why do they do that? Its been suggested that such aggregates may increase the micro humidity, thus helping the snails better cope with the lack of water (Giokas et al., 2005. J. Moll. Stud. 71:15–23). Not all species of Albinaria form such groups, however. I suspect there may be other reasons for group aestivation. I will return to this subject in the future.