Other mammals include the meadow vole, woodchuck and the prairie deer mouse. SNV can be contracted through the inhalation of virus-contaminated deer mouse excreta. Other native mammals include the black-tailed deer, mink, otter, raccoon, and deer mouse. The deer mouse is generally a nocturnal creature. Ehrlichiosis and babesiosis are also carried by the deer mouse. The deer mouse exists on all eight islands. Native land vertebrates are few, including the deer mouse "Peromyscus maniculatus" and some lizards. One complicating factor was the presence of the native deer mouse subspecies ("Peromyscus maniculatus anacapae"). The prairie deer mouse was found in open areas. Rodent hepacivirus is found in the deer mouse ("Peromyscus maniculatus"). However, it may be most closely related to the North American deer mouse. Like the deer mouse, it may carry hantaviruses, which cause severe illness in humans. The deer mouse can also be distinguished physically by its long and multicolored tail. The thirteen-lined ground squirrel and the prairie deer mouse were found in dry, open areas. Deer mouse breeding tends to be determined more by food availability rather than by season.