I thought I'd create a thread containing the various theories regarding the biology and behavior of yukkuris, and also to renew discussion regarding the subject, which I find quite interesting myself.
About the daily coexistence between Yukkuri and Human
http://yukkuri.shii.org/forum/show/4758
Disussion of shithead implication
http://yukkuri.shii.org/forum/show/524
Random yukkuri biology (Various headcanon)
http://yukkuri.shii.org/forum/show/2493
Yukkuri Stomach
http://yukkuri.shii.org/forum/show/2790
Behaviour Idea for Pet Yukkuris in Stories
http://yukkuri.shii.org/forum/show/2148
Biology 1
https://groups.google.com/forum/#!searchin/yufanfics/biology/yufanfics/QUYJ1pnImwo/34e0_oYiulQJ
Biology 2
https://groups.google.com/forum/#!searchin/yufanfics/biology/yufanfics/HH8Wf2yETt0/ek4ylWoSWNwJ
Biology 3
https://groups.google.com/forum/#!searchin/yufanfics/biology/yufanfics/IHgzL_pZ4L8/u7jcPSImapUJ
Updated by exitstrategy