Cut the head

• Use a circle cutter and push it into the centre of the cake.
• That centre piece is going to be the head.

Cut the body rings

• Cut the outside ring in half.
• Then cut the bottom half of that half in half again.

Flip and stick to the board

• Flip the pieces over.
• Stick the cake pieces to the board using the icing that's already on the cake.

Arrange the caterpillar

• Arrange all the pieces into the shape of a caterpillar.

Pipe the buttercream

• Use red buttercream for the head and 3 different shades of green for the body.
• Alternate all 3 colours and pipe them down the body until the whole thing is covered.

Smooth the piping

• Use a small palette knife to smooth out the piping.

Finishing touches

• Use M&M's for the feet.
• Use sherbet fizz sticks for the remaining details.