I think 隐藏 can also be used when the subjects are humans, animals, plants, or lifeless objects. It simply means "hidden from view." Ex. 他隐藏在路邊的草叢裏, 躲避敵人的追擊. In the case of 躲藏, it is usually used when the subjects are humans or animals. Use 躲藏 means you hiding and on the run because someone is searching for you and you don't want to be found out.

隱藏 is hidden [from view]. 躲藏 = escape into hiding, on the lam.

躲藏： vi. It has no object. basic meaning： to hide oneself/your body so that others can't see you or find you. 躲藏 is the active act of the Subject himself, that is to say, the Subject hide himself of his own will. you do it for fun or for safety. When use 躲藏， the structure of the sentence will be "Subject+躲藏", you can also add adv. of ways or places before 躲藏, and adv. of time or place after 躲藏. eg. 他在这儿躲藏了很久。He has hide himself here for long. 你还要躲藏多久？How long will you be hiding yourself ? 不要躲藏。Don't hide yourself. 他悄悄地躲藏在了门后边。He quietly hid himself behind the door. 隐藏：1.vi. it has no object. Basic meaning： to hide yourself in a place(so that others can't see you or find you) or in an organization (others don't know your real identity). The subject do it for safety or for a special purpose(eg, to get important information). When use 隐藏， the struction of the sentence is "Subject+隐藏”， you can add adv of place or time after 隐藏 ， or adv. of place before 隐藏。 eg.你在哪儿隐藏着呢？=where are you hiding yourself? 我一直在丛林里隐藏着。=I have been hiding in the bush. 他隐藏在这个组织内部是为了什么？=What is he hiding in this organization for? 2.vt. It has an Object 。 “隐藏+sth./sb.) for example: secret, identity, track， purpose 把 sth. 隐藏（passive） 没必要隐藏你的秘密了。=there is no need to hide your secret. 他把他的身份隐藏得很好。=He hide his identity very well. 他一直在隐藏他自己的行踪。=He has been hiding his track all the time.

"隐藏"is for object or things, e.我隐藏了一份秘密文件。i hide a secret document. “躲藏”is for human or other creature, e.有只兔子正躲藏在石头后面。there's a rabbit hiding at the back of the stone.

隐藏前一般为物，意为什么东西隐藏了，躲藏前一般是人