(SOLVED) 1980s Japanese anime style cartoon where animals and birds in the forest have a big battle against each other
I watched this on TV around 30 years ago. I didn't see the ending. I don't know if it was a movie or just one episode of a TV show. I saw this either on Nickelodeon or some other TV channel for kids with lots of cartoons. I turned off the TV in the middle of the battle.
I started watching it at the beginning. There was a bear who seemed to be the official king of all the non-winged animals in the forest or he had some similar type of leadership position. He and another mammal went to this bush which was the home of the king of the birds. They were just looking out of curiosity. The bird king was gone but his kids were there and they were annoyed by the bear and other mammal invading their privacy. They told their dad when he got back and the bird king flew off to demand an explanation from the bear while he was sitting on his throne. The bear didn't do or say what the bird king wanted so they decided to have a battle. Before the battle, the bird king sent a mosquito to spy on the non-winged animals. Perhaps the bird king was actually the leader of all winged animals. During the battle the birds had some sort of strategy to bombard the non-winged animals from the sky but the non-winged animals found some way to thwart that strategy and kept on fighting. It was around that point I turned off the TV.