IV 
ANALYSIS OF THE MAJOR ANIMAL 
HABITATS 
The purpose of this paper is to analyze only the animal hab- 
itats unaffected by man, or those which have remained in a com- 
paratively unaffected state. For that reason no attempt has 
been made to classify cultivated or pasture lands, save in those 
eases of the latter where indigenous forest trees are present. 
For this same reason all discussion and mapping of groves 
planted as windbreaks have been omitted, although the estab- 
lishment of animal associations in such groves offers some inter- 
esting problems for the ecologist. 
For the purpose of logical consideration the animal habitats 
of Johnson County will be discussed under two main headings: 
(1) terrestrial, and (2) aquatic. A third, which is really a 
minor heading, is transitional. This last will be discussed in 
connection with aquatic habitats. An additional group of hab- 
itats will at once be suggested by some workers in this field, 
namely, the marginal zones where the terrestrial and aquatic 
conditions meet. By this we have in mind those habitats pecu- 
har to the banks of streams, in contrast to the transitional 
habitats afforded by swamps and bogs. While these are un- 
questionably terrestrial from one point of view, in that they are 
upon the land, yet inasmuch as they are always the result of the 
most recent action of the stream, they will be discussed in con- 
nection with aquatic formations. 
| TERRESTRIAL HABITATS 
As already indicated, the terrestrial habitats yield to a ready 
division into two groups, (1) prairie and (2) forest. A sub- 
sidiary series of habitats must also be recognized, that of the 
marginal zone between forest and prairie, which, possessing some 
of the characters and forms of both, is identical with neither 
and, belonging definitely to neither, is a part of both. 
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