Question: Three distinct bird species, flicker, woodpecker, and elf owl, all inhabit a large cactus, Cereus giganteus, in the desert of Arizona. Since competition among these birds rarely occurs, the most likely explanation for this phenomenon is that these birds
A: have a short supply of resources
B: have different ecological niches
C: do not live together long
D: are unable to breed
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.