Little Mexican Toad

Adults range in length from 29-44 mm for females and 29-36 mm in males. Dorsal coloration is yellowish brown with many large black blotches which often form elongate spots. Ventral coloration is yellowish white with black spots across the pectoral region and along the lateral portion of the abdomen. The dorsal and lateral surfaces of the body are covered by numerous large conical tubercles. The chin is diffuse black in males with a well developed vocal sac. The parotoids are large, but low and relatively inconspicuous, with diffuse, dark pointed warts. Dark-tipped warts form a continuous ridge along the cranial crest.

Anaxyrus kelloggi is found primarily in the narrow Pacific Coastal Plain of western Mexico. It commonly inhabits the open, flat areas of the thorn forest and deciduous tropical forests below 700 ft in elevation.

These toads call from the edges of ponds, either in the water or a few centimeters from it. Eggs are laid singly or in short strands. They share a zone of sympatry with A. retiformis, and studies suggest A. retiformis may be replacing A. kelloggi to the south and west of Hermosilla due to agriculture-mediated habitat changes.

The little Mexican toad (Anaxyrus kelloggi), formerly Bufo kelloggi, is a species of toad in the family Bufonidae. It is endemic to Mexico and found in the Pacific coastal plains between central Sonora and Nayarit. The specific name honors Remington Kellogg, who was an American zoologist and a director of the United States National Museum.

The species' natural habitats are thorn forests and tropical deciduous forests on coastal open lowlands to 200 m (660 ft) above sea level. It is tolerant to human disturbance and can breed in artificial water bodies such as dams.