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;