13 May 2009

A peculiar anthill

anthill
Photographed near Tampa, Florida last month.

How do they build that overhanging rim around the opening?

1 comment:

Tristram Brelstaff said...

It might just be a side-effect the particles forming the 'rim' being deposited when they were damper, and hence more 'sticky', than those forming the outer parts. These damper particles presumably came from deeper in the soil.