CHAPTER VI.. Dwellings

DWELLINGS

Animals naturally provided with dwellings--Animals who increase their natural protection by the addition of foreign bodies--Animals who establish their home in the natural or artificial dwellings of others--Classification of artificial shelters--Hollowed dwellings--Rudimentary burrows--Carefully-disposed burrows--Burrows with barns adjoined--Dwellings hollowed out in wood--Woven dwellings--Rudiments of this industry--Dwellings formed of coarsely-entangled materials--Dwellings woven of flexible substances--Dwellings woven with greater art--The art of sewing among birds--Modifications of dwellings according to season and climate--Built dwellings--Paper nests--Gelatine nests--Constructions built of earth--Solitary masons--Masons working in association--Individual skill and reflection--Dwellings built of hard materials united by mortar--The dams of beavers.