A hypothetical bat species (species 1) lives in a city. Another hypothetical bat species (species 2) established a population in the same city after a number of individuals escaped from a zoo. In isolation, each species prefers to roost in buildings that are three or more stories tall.

After bat species 2 becomes established in the city, you observe that bat species 1 is only found roosting at the top of short buildings that are less than 3 stories tall, while bat species 2 roots only at the top of building that are three or more stories tall.
Roosting areas in buildings of any height are the of both bat species.
A. adaptation
B. fundamental niche
C. resource partitioning
D. realized niche
E. competitive exclusion