With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Billy Ray Cyrus was in Hannah Montana during 2008.
text_B: Richard Despard Estes -LRB- born 1928 -RRB- is a biologist specialising in the behaviour of mammals in mainland Africa .. biologist. biologist. behaviour. ethology. Africa. Africa. He is particularly interested in studying wildebeest .. wildebeest. wildebeest. This interest lead Rod East , the former cochair of the Antelope Specialist Group of the IUCN-World Conservation Union , to dub him the ` Guru of Gnu . '. World Conservation Union. World Conservation Union. It has been suggested that Estes is responsible for most of the world 's knowledge of wildebeest behaviour .. behaviour. ethology. wildebeest. wildebeest. Estes chose to study wildebeest because he thought they were ` the most interesting ' animals he knew , particularly in their rutting behaviour .. behaviour. ethology. wildebeest. wildebeest. rutting. Rut ( mammalian reproduction ). He obtained his doctorate in the early 1960s with a thesis on the wildebeest of the Ngorongoro Crater , in which he advanced the theory that the females ' estrus was triggered by the rumbling ` love call ' of the males .. wildebeest. wildebeest. doctorate. doctorate. Ngorongoro Crater. Ngorongoro Crater. estrus. estrus. Estes has spent most of the ensuing 40 years doing field work in Africa .. Africa. Africa. In 2004 he began a project in cooperation with the Smithsonian Institution to test his early theory using new advances in molecular chemistry .. Smithsonian Institution. Smithsonian Institution. molecular. molecular. chemistry. chemistry. Estes has written two guides for travellers to Africa , The Behavior Guide to African Mammals -LRB- considered the standard reference of its kind -RRB- and The Safari Companion .. Africa. Africa
not_related.