请调整浏览器窗口大小或者请使用手机查看!
The most fundamental ingredient in the recipe for survival is food. Everything else is an accessory, making the fight for food the most significant.
For species that live in packs or pods, family is certainly worth fighting for as the survival of each individual is tied to the success of the group.
The fight for romance and reproduction stimulate the most striking and diverse behaviours of the animal world, ranging from dancing to battling.