| A | B |
|---|
| pest | a invasion of undesirable plants, animals or insects |
| starlings | black birds with white spots in the form a star |
| mussels | a sea shell animal living underwater |
| to thrive | to expand, to grow |
| livestock | domestic animals that we can eat |
| flock of birds | a large group of birds |
| to repel | to reject |
| to quarantine | to aisolate or keep separate |
| swift | quick |
| ecosystem | a form of living in groups |
| alien | nonnative |
| to hike | to go for a long vigorous walk |
| trail | a route, a path |
| anthropology | the study of human beings |
| descent | going down towards the earth |
| blisters | small injuries caused by friction |
| to overlook | to look from a high point |
| pilgrimage | going to a holy place for worship |
| to show off | to demonstrate superiority |
| condors | very large birds in the Andes |
