"Non-biased" data?

Eric Brunnemann is the superintendent at Pinnacles National Monument. In this clip, you'll hear him say that it's his job to provide "the best non-biased possible scientific data available" on condors at that facility. But how non-biased can he be when he refers to the birds as "my flock"?

As I see it, there are two jobs Mr. Brunnemann could be doing with regard to condors: He can be an advocate for the birds and thus feel somewhat proprietary about them; or, he can be a disinterested observer providing unbiased data. He can't be both, however. I suspect that he's really doing the first job and God bless him for that. But, that means that the "data" he presents here must be seen as opinion.