Not sure what category this comes beneath, but here go. Where did the jargon "Monkey Wrench" and "Crow Bar" Someone asked me where these lingo originated from and I hold no...

Someone asked me where these lingo originated from and I hold no idea. Would anyone out here be able to answer these for me?
Thanks for your help out.

Peter
Question nearly flooring?
Answers:    MONKEY WRENCH RESEMBLESS A MONKEY.
CROW BAR RESEMBLESS A CROWS CLAW !
Does a chimney want to be cleaned if...
hold the monkey bar (pipe wrench)..sideways and see what it looks resembling...cant tell u aqbout the crow lump..