Grammar Check for a 7-Year-Old's Paragraph About Polar Animals

The original paragraph has a few grammatical errors. Here's a corrected version:

"You can't find frogs at the poles. Polar animals aren't afraid of the cold. Take, for example, polar bears, walruses, and penguins. Penguins, by the way, are birds that can't fly but swim well."

Explanation of corrections:

• Changed aren't be afraid to aren't afraid to make the sentence grammatically correct.
• Added commas after take and walruses for clarity and correct punctuation.
• Corrected the contraction can’t in can’t fly to use an apostrophe (’).