Here is a photo of a western newt with the labial flap, a flap of skin on the upper jaw of the aquatic phase of newts and larval salamanders that extend beyond the outline of the lower jaw. This flap of skin probably helps the newts and larval salamanders to suction feed because newts and metamorphosing larval salamanders that lack this flap are often unable to catch small aquatic prey by suction. The flap is encircled in the photo by the dark colored line. Newts that have the labial flap sometimes look somewhat like the muzzle of bulldogs.

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