Bufo marinus has a grey olive brown dorsal skin with many warts ending in dark brown caps. The ventral skin tends to be a whitish yellow with dark brown speckles or mottles and is granular. Bufo marinus possesses huge paratoid glands stretching from the anterior side of the tympanum to halfway down the back. A high bony ridge meets at the snout between the nostrils. Bufo marinus, like other nocturnal species, has horizontal pupils. Bufo marinus can reach a maximum length of 238 millimeters, although generally is approximately 150 to 175 millimeters (Cogger 1983).