The following are the chief areas of vegetational activity usually recognized: (1) The icedeserts of the arctic and antarctic and the highest mountain regions, where there is no vegetation except the lowest forms, like that which causes " red snow." [Please select]
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Most series of specimens are obtained by hunting after rains on roads or other natural breaks in vegetational cover. [Please select]
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Vegetational Key as Follows: 1) Pinyon-Juniper-Muttongrass 2) Pinyon-Juniper-Mixed Shrubs 3) Juniper-Pinyon-Bitterbrush 4) Juniper-Pinyon-Mountain Mahogany 5) Grassland with Mixed Shrubs 6) Big Sagebrush 7) Pinyon-Juniper-Big Sagebrush 8) Grassland. [Please select]
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Leopold (1950 and 1959) recognized five principal vegetational types in Tamaulipas as follows: Mesquite-grassland; Pine-oak Forest; Thorn Forest; Tropical Deciduous Forest; and Desert. [Please select]
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The principal animal habitats are found in three vegetational associations (plates 6 and 7). [Please select]
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This vegetational association may have few rodents because there is a shortage of places where they can hide. [Please select]
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