The sentence you wrote is almost perfect! It says, "A walrus can use its tusks to climb onto the ice and to defend itself."
Here's why it's good:
- It starts with a capital letter.
- It has the subject "A walrus" and the verb "can use."
- It correctly uses "its tusks" to show the walrus owns the tusks.
- It clearly says what the walrus can do with its tusks: climb onto the ice and defend itself.
- The sentence has proper punctuation.
If you want to make it even simpler and smoother, you can also say: "A walrus uses its tusks to climb onto the ice and defend itself." Both ways are correct!