The correct answer is "The two birds do not belong to the same population because they cannot interbreed".
Explanation:
A population is defined as a group of individuals of the same species living in the same are at the same time and with the capability of interbreeding. In this case the two birds share the same area and time, but they are not able to interbreed. Excluding the possibility that the two birds are of the same sex, we can speculate that the two birds are of the different species even though they look very similar. Therefore, we can conclude that the two birds do not belong to the same population.
These two similar birds do not belong to the same population because a population is made up of groups of similar organisms of the same species that occupy the same geographical region including the capability to interbreed. This two birds despite the similar markings, they do not have the capability to interbreed thus they are not of the same population.
