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Fig. 2. A typical habitat of Bufo cognatus just south of Norman, Oklahoma. The field in the background has a large population of this species. In 1938, the toads bred in the flooded field shown in the middle distance.
Fig. 3. Adults of Bufo cognatus, male on the right, female on the left.
Fig. 4. Buffalo wallows just northwest of Norman, Oklahoma (station 1). Bufo cognatus bred extensively here in the spring of 1938.
Fig. 5. Flooded ditch with a flooded field in the background. Picture taken during the height of the breeding season, 1938, just south of Norman, Oklahoma. This site has been watched closely since 1934 by Mr. A. H. Trowbridge, by myself or by us both and no evidence has been found that B. cognatus ever uses the ditch for breeding, although the field was used extensively in 1938.
Fig. 6. The pool at station 4 looking northwest. Great numbers of Bufo cognatus eggs were laid in the northern end of this pool in 1938, but no larvae nor emerging young were found in the deeper water in the foreground. |
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