1. Houses made by protists
Mike Hansell 
Current Biology 
Volume 21, Issue 13, Pages R485-R487 (July 2011)
DOI: /j.cub
Copyright © 2011 Elsevier Ltd Terms and Conditions

2. Figure 1
Difflugia corona case of quartz grains (reproduced with permission from the Natural History Museum Picture Library).
Current Biology  , R485-R487DOI: ( /j.cub )
Copyright © 2011 Elsevier Ltd Terms and Conditions

3. Figure 2
Case of a trochamminid foraminiferan constructed from algal coccoliths (reproduced with permission of Erik Thomsen).
Current Biology  , R485-R487DOI: ( /j.cub )
Copyright © 2011 Elsevier Ltd Terms and Conditions