Solution

162729

First name
Vinnie
Age
0

The mouse weighs 1. The robin weighs twice as much as the owl, which is 2. That means 2 mice on one side and one robin on the other side will balance. The porcupine weighs 3. That means that a porcupine on one side (3) will balance with a mouse and a robin on the other side (2+1=3). The owl weighs 4. One owl can balance with a porcupine and a mouse (3+1=4) or with 2 robins (2+2=4)