In this study, the prevalence of Haemosporidians in birds of Northern Michigan was investigated with an emphasis on the parasite Plasmodium in passerine birds. Birds caught and banded by mist-netters were sampled for blood and recorded by species, net number, sex, age, and swab number. The total prevalence of blood parasites in the samples was 23.8%. Birds caught at the CEMA banding site had the highest prevalence of malarial infection, and the birds of the NOMA banding site had the lowest. Mann-Whitney Tests resulted in two-tailed p-values of 0.001, .0762, and 0.003 for comparisons of prevalence between NOMA and CEMA, CEMA and SOMA, and NOMA and SOMA, respectively. Kruskal-Wallis Tests regarding bird age, location and families resulted in p-values of 0.259, 0.004, and 0.009, respectively. Tests for sex showed no significant differences between prevalence of infection in male and female hosts.http://deepblue.lib.umich.edu/bitstream/2027.42/55127/1/3572.pdfDescription of 3572.pdf : Access restricted to on-site users at the U-M Biological Station