Here are entered works on the shelters and structures that humans construct and provide for wild or domestic animals. Works on the natural shelters and homes that animals build for themselves, such as burrows, dens, lairs, lodges, etc., are entered under Animals--Habitations. --subdivision Housing under individual animals and groups of animals, e.g. Cattle--Housing; Pets--Housing
Here are entered works on natural shelters and homes that animals build for themselves, such as burrows, dens, lairs, lodges, etc. Works on the shelters and structures that humans construct and provide for wild or domestic animals are entered under Animal housing. --subdivisions Habitations and Nests under individual animals and groups of animals, e.g. Fishes--Habitations; Fishes--Nests
Here are entered works on biological evolution. Works on the general concept of evolution are entered under Evolution. --subdivision Evolution under individual animals and groups of animals and under individual organs and regions of the body, e.g. Cattle--Evolution; Heart--Evolution