What is the creationist view on animals equipped with lethal weapons? If God created the world with the intention that his creatures should live in harmony (as pictured in Isaiah 11:6-9) why did he create some animals with lethal weapons?

Why do spiders make webs to trap insects? Why do scorpions have venomous stings? Why do lions have teeth that are great for eating meat but lousy for eating grass?
The answer is He didn't create animals with lethal weapons in the beginning.  In the beginning (Genesis 1) there was no death, thus no animal ate another.  "By man came death" through the entrance of sin. (1 Corinthians 15:21, Romans 6:23)  Therefore after sin animals began to devour one another.  A full 40 minute well done presentation on the creation and fall of man is found here- http://www.youtube.com/watch?v=ZQmLVU_nvo8

Hope that helps :)