Because 'Cainus Anus' is the name of a band that rocks.
(Actually Cainus Anus wasn't originally our name it was CeeDee-Ar (or CDR). On our first CD our album was called "Cainus Anus" in australia, the band then split in two and my half retained the name Cainus Anus)

only on Wednesday while the hampster is running

sometimes it eats pie

if the peacock was in the hatch

"Well... Here is how it happened. we were stuffing around with a guitar doing some tunes when for no particular reason we decided to say 'hippi' multiple times while someone was playing a tune, thereby creating a 'song'. I came up with an idea to record this 'song' on my computer using a very small microphone, similar in size to a large pea. Well, we had 2 takes of hippi both resulting in something that made us less than happy with it. So on the third take (or hipi 2.5, as we in CeeDee - Ar call it.) JACKPOT!!! It really was gold, no written lyrics no work not even a good tune, the two of us had just begun our first Album "CAINUS ANUS" now, over a year later Grant the original band member has returned to his homeland while I continue the journey of the Cainus Anus by recording sh*** for Part 2." Click Here for a full history.

most animals, carrots, pineapples and a few other vegetables.

The tree

a microphone (have been known to record with headphones sometimes),
Guitar (Classical/Electric/Acoustic however i feel at the time),
Drums (most songs with drums, the drums are looped/elctronic but i have started to put real drums in some.),
amp, necessary FX, "ACIDpro" and sometimes use keyboards.