The male creature is naturally competitive within every environment that it finds itself in. Every man would therefore always strive to locate his strength as defense against the others. Most men find strength in money because this is a factor that can elevate a physically weaker man into a stronger one. The male animals on the other hand would use their built to defend their colony. The bulls in the image is one of these examples. This is also a cultural sport (bull fighting) for the Luhya tribe of western Kenya which is where I come from.