Animal Info - Glossary U

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.
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).
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.

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Last modified: April 26, 2006;

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