We have several 'How to draw...' books and cards for the children in our art center. Step by step and using shapes, letters and numbers simplify the drawing process.
Want to do more? I love Ed Emberly. Check out his step by step drawing using fingerprints. Don't want to use a fingerprint? Draw an oval.
You can also use YouTube to draw with your child. Choose a polar animal-say 'walrus'. Search 'how to draw a walrus for children/kids/preschool or easy'. Many animals are available. As with all things YouTube check out the video before you share with your child.
Have fun drawing polar animals with your child!