NESTS AND NEST-BUILDING IN BIRDS 



191 



The fantail warbler (a^) in a somewhat similar fashion binds 

 together the free upright stems of grass in a way to form a 

 support for a globular nest which is then built, with inner cup 

 presumably modelled by the usual turning movements, finally 

 bringing the grass together above its nest thus formed. This 

 is certainly a very different form of suspension from that sought 



Figure 10 — Pendulous nest of Baltimore oriole, Icterus galbula, showing typical 

 method of suspense, and treatment of outer wall. 



by most orioles, weavers, and vireos, but it may represent a 

 mile-post on the evolutionary road along which such forms as 

 build more strictly pendulous nests have passed. Nests of cer- 

 tain wrens and of redwing blackbirds, w^hich conform strictly to 

 what we have called the standing type, are sometimes suspended 

 between the culms of sedges or flags in a not wholly dissimilar 

 fashion. 



