There are several more monkeys in the temple. There's a total of 7. You have to find them all before you can kill the boss.
in twilight princess? there all trough out the game
you need four monkeys to get across the bridge in Zelda twilight princess.
the forest temple
9
there are 8 monkeys there should be a room where you can check how many you got
In the first dungeon.. If you have a compass, you can find them easily
In Twilight Princess, the only monkey whose name is given is the forest temple boss monkey - his name is Ook.
You have to braek the cages! knock them down/ use the sword.
collect all the monkeys then defeat the flower boss
8 in all, including the four you have to find before the mini-boss
you can get the monkeys in many different orders. I recommend using this guide on ign:
Just beyond the broken bridge. You can access him by freeing the first four monkeys.