Animal Info - Glossary U

Ubiquitous: Existing or present everywhere.
Ultrasonic, Ultrasound: Sound that has a frequency higher than the highest frequency a human ear can hear - about 20,000 Hz.
Understory: The layer of shrubs, herbs and small trees beneath the forest canopy. The lower level of vegetation in a two-level vegetation system (see overstory).
Ungulate: A hoofed mammal which is usually adapted for running. Includes deer, cattle, gazelles, horses, elephants, and hyraxes. Most are large herbivores. The term no longer has taxonomic significance.

Last modified: April 26, 2006;