Eccentric left collection of animals with tails removed (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

GONe (left) + ZOo (collection of animals) minus their last letters (with tails removed). I’ve only reallyy come across the term “gonzo” in relation to the writings of Hunter S Thompson and other journalists, but apparently it’s also used to describe anything unconventional or extreme