sartore: they all have value.f years of evolution, all equal, even cockroaches. ♪ burnin' love hunk-a, hunk-a burnin' love ♪ ♪ i'm just a hunk-a, hunk-a burnin' love ♪ ♪ just a hunk-a, hunk-a burnin' love ♪ ♪ hunk-a, hunk-a burnin' love. ♪ that is so cool. i wish he was the 5,000th species, you know that? tracey dearlove: so just watch your step. and this is the trail, huh? this is the trail, yeah. sartore: you know, i think i have the best job in the world. (gasps) most days. do you think the folks at home seeing this will think i'm a weenie? (laughs) because i am. sartore: i'm traveling the globe to photograph the world's rarest creatures. and that means getting very close, to all kinds of species. (softly): okay, here we go, here we go. sartore: i'm joel sartore, and i've been a national geographic photographer for more than 25 years now. the pictures that have always meant the most to me are the ones that deal with vanishing places and animals, things that might not be around for much longer. (camera clicking)