| Term | Definition |
| existence | [uncountable] the state of existing |
| evidence | [uncountable] facts or signs that show clearly that something |
| phenomenon | [countable] something that happens or exists in society, science, or nature, especially something that is studied because it is difficult to understand |
| specimen | a single example of something, often an animal or plant |
| roam | [intransitive and transitive] to walk or travel, usually for a long time, with no clear purpose or direction |
| sighting | [countable] an occasion on which something is seen, especially something rare or something that people are hoping to see |
| diversity | [singular] a range of different people, things, or ideas |
| elevation | [singular]TM a height above the level of the sea |
| slope | [singular] the angle at which something slopes in relation to a flat surface: |
| stare | to look at something or someone for a long time without moving your eyes, for example because you are surprised, angry, or bored |
| witness | somebody who sees something such as a crime or unusual action |
| remote | far from towns or other places where people live [= isolated]: |
| territory | land of a particular type |
| peak | the sharply pointed top of a mountain |
| ravine | a deep narrow valley with steep sides |