Match the animals in Group I with the major form of excreted nitrogen metabolite in Group II.
\[
\begin{array}{c|c}
\text{Group I} & \text{Group II} \\
\hline
P:\; \text{Bony fishes} & 3:\; \text{Ammonia} \\
Q:\; \text{Lions} & 1:\; \text{Urea} \\
R:\; \text{Birds} & 2:\; \text{Uric acid} \\
\end{array}
\]