Here are 5 short ways to say it, suitable for a 7-year-old:
- Walrus uses its tusks to climb onto the ice and protect itself.
- The tusks of a walrus help it climb onto ice and stay safe.
- With its tusks, a walrus climbs onto ice and defends itself.
- A walrus uses tusks to get on the ice and keep itself safe.
- Its tusks let a walrus climb up and defend itself on the ice.