There are some streams of thought connected to rebirth which indicate higher value of humans when they believe that bad Karma will result in you being reborn as a lower life form.
There are some like Advaita where God and all creations are one and the same. This inherently implies all creations are God and thus have same value. No hierarchy.
In Sankara's Advaita on the other hand he believed in the authority of Vedas and they indicate a hierarchy. Other Bhakti gurus have believed only in what is humane even if scriptures say otherwise.
In Hinduism there is usually no one truth. There are multiple paths and they all eventually lead to same path if you are always trying to be the best you can. Different scriptures give different opinions in the same topic.
So just believe what feels right to you. Anyone who claims to be an expert or that there is only one truth is misguided.
 According to Vivekachudamani
2. For all beings a human birth is difficult to obtain, more so is a male body; rarer than that is Brahmanahood; rarer still is the attachment to the path of Vedic religion; higher than this is erudition in the scriptures; discrimination between the Self and not-Self, Realisation, and continuing in a state of identity with Brahman - these come next in order. (This kind of) Mukti (Liberation) is not to be attained except through the well-earned merits of a hundred crore of births.