"It is likely that myself and fellow co-authors were the last people to observe an abundant population of one of the world’s largest bumble bees, Bombus dahlbomii. Only five years after our study, it is no longer possible to ask follow up research questions as dahlbomii has nearly gone extinct in Patagonia. During the past two decades, dahlbomii has suffered dramatic population declines due largely to the invasion of Bombus terrestris, the buff-tailed bumble bee. This invader spreads parasites to dahlbomii and has overwhelmed ecosystems as an aggressive competitor. Our study examined the relationship between dahlbomii and terrestris in a national park in Argentine Patagonia."