You had better be careful posting images like that or Mac-7 will become utterly convinced that Japanese people in the 1930s and 40s were rabbits; invincible rabbits that had no concept of surrender.
Not at all. Actually I recognize it as a powerful tool.
But here you have something different. The other animals are shown as "simple", most not even knowing how to wear clothes. And happily work to assist the obviously superior Japanese animals, who even know how to read and write (something none of the other animals know how to do). They help them build their bases, and freely give them food or anything they need.
And are completely baffled at their marvelous technology, like an airplane.
Knowing how the Japanese actually treated those in areas they conquered, I find it revolting to be honest. But also that it is an interesting piece of art, as well as a snapshot into the culture of the time.