Using gland regions on their heads, warthogs mark poles and other objects for self-orientation. Males often mark during the mating season. The male also sprays urine when searching for and inspecting sleeping cavities.
2017
1980
1945
2009
2023
2005
1984
1965
1950
1940
1969
2024
1963
1942
1957
2018
2011
2020
1990