One day three little otters left their home. They went out to build their own homes. One home was made out of mud. The second home was made out of sticks. The third home was made out of mud and sticks.
Now, one day a cougar came along and destroyed the house of mud. The first river otter swam to his brother’s house made of sticks. The cougar also destroyed the house of sticks. The two otters swam to their other brother’s house made of sticks and mud.
Now, you would expect that the cougar could destroy the house of sticks and mud. BUT! The cougar could not destroy the house of sticks and mud. And the three river otters lived happily ever after.