Major workers of the South American species Pheidole aberrans have an unusually large head even for a Pheidole.

Bento Gonçalves, Rio Grande do Sul, Brazil
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Oecophylla smaragdina weaver ant major worker.

Cape Tribulation, Queensland, Australia
Oecophylla smaragdina weaver ant worker.

Cape Tribulation, Queensland, Australia
A major worker of Camponotus suffusus guards the nest entrance. Although many people think of Camponotus as the wood-inhabiting carpenter ants, many species nest in soil.

Diamond Creek, Victoria, Australia
Oecophylla smaragdina weaver ant worker.

Cape Tribulation, Queensland, Australia
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. The blunt head serves as a living door to this species' twig nests.

Laboratory colony at the University of Central Florida, USA
See photo in original gallery.
all images and text © Alex Wild 2001-2013