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Step 1
Marvel at the size of the Bull Frog. This frog is the largest frog in North America. It is typically between 9 and 20 cm in length and can weigh up to 750 g. Female Bull Frogs are larger than males.
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Step 2
Observe the Bull Frog's coloring. The top of a Bull Frog is usually a plain green or nearly plain green color. They can have a gray or brownish net-like pattern on their backs, however. The bellies of Bull Frogs are usually whitish or cream in color with dark gray mottled spots. The bellies, especially those of male Bull Frogs, can have a yellowish tint to them.
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Step 3
Take note of the physical features of this large frog. Bull Frogs have long and large legs. They also have webbing on their hind feet. The fourth toe on the hind feet characteristically extends past this webbing. Their front feet (fingers) are not webbed. They also do not have dorsolateral ridges on their backs. The ridges that they do have end near their eardrums. Their skin is also usually quite smooth.
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Step 4
Listen to the Bull Frog's sounds. They have a very deep voice. The sounds that the Bull Frog makes often sound similar to "jug-o-rum".
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Step 5
Learn about the habitat and range of the Bull Frog. These particular frogs live in most of North America, ranging from the Rocky Mountains to the east coast and from central Florida north to Nova Scotia. Bull Frogs are aquatic animals who live in fairly large bodies of water such as ponds lakes, bogs and parts of streams. They can often be seen hiding in vegetation or on the edge of the water.
