Rubber ducky or regular ducky?

The pattern and tutorial is available here:
https://youtu.be/9DOk0SjtRwE

Pattern Details:
Hook size: 3.5mm
Yarn: 8ply
Terms: US
Difficulty: Advanced Beginner
Finished Size: 13cm

Materials & Supplies:
To make this pattern you will need:
• Yarn
• Scissors
• Stitch Markers
• Needle
• Pins
• Stuffing
• 12mm Safety Eyes