日本語 Japanese Ask Questions Thread 3

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Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

I have studied Japanese for a while, but barely encountered informal Japanese. The sentence:

猫は食べます。

for instance; how would I go about saying this informally? From what I understand, "-masu" form is fairly formal and not commonly used in informal speech.