Let's look at your sentence: "An iguana’s scales change colour when it gets warm or cool, dark or bright around them."
Here's a clearer version:
"An iguana’s scales change color when it gets warm or cool, or when the light is dark or bright around it."
Explanation:
- Use "color" or "colour" depending on your English preference (American or British).
- Instead of "dark or bright around them," it’s clearer to say "when the light is dark or bright around it." This helps explain what "dark or bright" refers to.
- Since "iguana" is singular, use "it" instead of "them."
So the corrected sentence is:
"An iguana’s scales change color when it gets warm or cool, or when the light is dark or bright around it."