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Beside this, why do saiyans turn into monkeys?
Absorbing the Bruits Waves through their eyes triggers areaction within their tail that begins the transformationinto a Great Monkey.This occurs because Saiyansare able to absorb the light through their eyes thatcreates a reaction that activates a certain gland in theirtails to make the transformation occur.
Similarly, you may ask, why can't Vegeta go ssj3?
The reason Vegeta could'nt go SSJ3 isbecause Goku is a Honour Gene. Honour Gene's can go SSJ3.However, Vegeta wasn't a Honour, instead he is a Pride Gene.Pride Gene's can only go SSJ, ASSJ, USSJ, SSJ2, andSSJ4.
"Great Monkey") is a giant, anthropomorphic,monkey-like creature that Saiyans can transform intoat the full moon to increase their already formidable strengthtremendously. Dragon Ball GT Perfect Files speculates thatSaiyans were originally Great Apes who gained intelligenceand took on a humanoid form.