The phrase "fellow humans" refers to people who are part of the same group as ourselves – humans. It is a way to show that we are speaking to or referring to others who share the same species as us. Full definition
Personal success and recognition come and go, but making a difference in the real estate industry, in the lives of fellow human beings, and in our great country lasts for generations. (realtormag.realtor.org)
And given the nature of the modern organization, if you're a manager, of course you've managed some number of fellow human beings. (theladders.com)
Animals aren't people; how I deal with animals has nothing to do with how I deal with fellow human beings. (crappypictures.com)