Rats and hawks. With a bit of cover or a rat wall if necessary, you can defend against the hunter until your hawks neutralise him, and then you destroy him with rats.

5 hawks to the hunter as he is the immediate threat. Hawks are the fastest animal to respond to the fastest killer, the hunter. This will be followed up by 150 rats to take out his eyes and burrow into his skull.

500 rats and 1 hawk for each gorilla and bear. 300 and 200 rats respectfully for each lion and buffulo. These also get a total of 7 hawks to keep them busy until the rats get to work.

50 rats for each wolf, and 1 hawk per 3 wolves. The crocs get 1 hawk each and 50 rats to target their eyes. This is the weakest defence, but crocs are slow over larger distances.

I would take cover until the hunter is neutralised, even if that means taking cover behind an attacking bear. I would keep a reserve of 2000 rats and 15 hawks to deal with any animals that break through the defences. Where required I would re task the rats and hawks depending on how their individual battles are going, all the while dodging crocs and fighting off the stonger wolves.

Also the pessimistic solution aligns with this: which way would you prefer to die? To be shot by a hunter and ripped apart by gorillas, or eaten alive by rats?