Cardueline finches can be found in many areas of the world, including north america and asia. hawaiian honeycreepers, which are found only in hawaii, have been found to have dna commonalities with this group of finches that indicate they have a common ancestor. which mechanism might have led to the appearance of the hawaiian honeycreeper?

Geographical Isolation is the mechanism that might have led to the appearance of the Hawaiian honeycreeper.

Geographical Isolation is the term used that refers to a population of animals, plants, or other organisms that are separated and unable to exchange genetic materials with other organism of the same species.

Geographical Isolation may be a result of coincidence or accident.

Here are some factors of Geographical Isolation:
1) Isolation by barriers 
2) Isolation by distance
3) Isolation after an Event
4) Isolation by separation