What does it mean for an animal to be 'Herbivorous'?

• Herbivorous (adjective)
English Meaning: (of an animal) feeding on plants.
Bangla Meaning: তৃণভোজী।

Example Sentence:
1. Deer are herbivorous animals, feeding on grasses, leaves, and other plant materials.
2. The elephant is one of the largest herbivorous mammals, consuming vast quantities of vegetation each day.

Source:
1. merriam-webster.
2. Bangla Academy Dictionary.