The sentence you wrote is very good! It is clear and describes animals in the mountains nicely. Here's the sentence with a few small changes to make it grammatically perfect:
Up in the mountains, a fluffy chinchilla basks in the sun, and a chamois hops from rock to rock. In the sky, a condor soars high, and mallards fly to warm countries.
Explanation:
- In the first sentence, the structure is good. A chinchilla and a chamois are both described with actions connected by 'and'.
- In the second sentence, adding a comma before 'and mallards fly to warm countries' helps separate the two actions clearly.
- You do not need 'a' before 'mallards' because 'mallards' is plural.
This way, your sentence is both clear and grammatically correct!