Britannica
Sources used in this answer
Why do cattle have a wide mouth and a gummy pad instead of upper incisors?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
bovid
American bison, or plains buffalo (Bison bison).
Cattle have a wide mouth and a gummy pad instead of upper incisors as a specialized adaptation for grazing on tough vegetation.1
The absence of upper incisors and canines, replaced by a tough, fibrous dental pad, allows the animal to effectively grip and rip up grass while feeding. This anatomical structure is part of a broader evolutionary strategy that enables cattle to quickly ingest large quantities of forage while in the vulnerable head-down position required for grazing. Because they are ruminants, they do not need to chew their food thoroughly during this initial ingestion phase; instead, they later regurgitate and re-chew the material, known as "chewing the cud," to break down tough plant fibers for digestion.12