Black wildebeest
Black wildebeest act as hosts to a number of external and internal parasites. A study of the animal in Karroid Mountainveld (Eastern Cape Province, South Africa) revealed the presence of all the larval stages of the nasal bot flies "Oestrus variolosus" and "Gedoelstia hässleri". The first instar larvae of "G. hässleri" were found in large numbers on the dura mater of wildebeest calves, specially between June and August, and these later migrated to the nasal passages. Repeated outbreaks of mange (scab) have led to large-scale extinctions. The first study of the protozoa in blue and black wildebeest showed the presence of 23 protozoan species in the rumen, with "Diplodinium bubalidis" and "Ostracodinium damaliscus" common in all the animals.
Tongass National Forest
In addition, there are several bear-viewing areas in the forest. The southernmost site is in Hyder, Alaska. Both black and brown bears can be seen in safety from an elevated viewing platform and boardwalk. Forest staff are on site to answer questions. The Anan Bear Viewing area is only reachable by boat from Wrangell. Both black and brown bears are seen from early July through August. There is an extensive viewing platform and deck above the river for viewing. Pack Creek Bear Viewing area at Admiralty Island National Monument is a 30-minute floatplane trip from Juneau.