This is really interesting! It seems like there’s also compelling evidence for more than 2:
While there is no direct evidence that any of the 25 [18] species of Hawaiian land birds that have become extinct since the documented arrival of Culex quinquefasciatus in 1826 [19] were even susceptible to malaria and there is limited anecdotal information suggesting they were affected by birdpox [19], the observation that several remaining species only persist either on islands where there are no mosquitoes or at altitudes above those at which mosquitoes can breed and that these same species are highly susceptible to avian malaria and birdpox [18,19] is certainly very strong circumstantial evidence...
The formerly abundant endemic rats Rattus macleari and Rattus nativitas disappeared from Christmas Island in the Indian Ocean (10°29′ S 105°38′ E) around the turn of the twentieth century. Their disappearance was apparently abrupt, and shortly before the final collapse sick individuals were seen crawling along footpaths [22]. At that time, trypanosomiasis transmitted by fleas from introduced black rats R. rattus was suggested as the causative agent. Recently, Wyatt et al. [22] managed to isolate trypanosome DNA from both R. rattus and R. macleari specimens collected during the period of decline, whereas no trypanosome DNA was present in R. nativitas specimens collected before the arrival of black rats. While this is good circumstantial evidence, direct evidence that trypanosomes caused the mortality is limited
This is really interesting! It seems like there’s also compelling evidence for more than 2: