* Defining "tribe": The term "tribe" itself is somewhat ambiguous and can have different meanings.
* Sub-groups and variations: Many groups have sub-groups or dialects that may or may not be considered distinct tribes.
* Ongoing research: Ethnographic and linguistic research continues, which may lead to the recognition of new groups or the reclassification of existing ones.
However, we can provide you with an estimate:
* Over 50: Mindanao is home to a vast diversity of indigenous peoples. It is commonly understood that there are over 50 ethnolinguistic groups on the island.
* Large Number: The number may even be significantly higher when considering smaller subgroups and local variations.
To get a better understanding, you can explore resources from organizations like:
* The National Commission on Indigenous Peoples (NCIP): The NCIP in the Philippines is a government body that focuses on indigenous peoples' rights and development.
* The Mindanao Peoples' Caucus: A coalition of indigenous peoples' organizations in Mindanao.
* Academic institutions: Universities and research centers often have experts on Philippine ethnolinguistics.
These resources can provide more detailed information about the specific ethnolinguistic groups in Mindanao.