Bird watching, ecology: ravens and crows
Self-tutoring about birds and ecology: the tutor mentions ravens and crows.
The competitive exclusion principle states that two animals cannot occupy the same niche – ie, role – in the same environment: one always out-produces the other, and takes sole occupancy. I’ve mentioned this idea before, here.
What about crows and ravens? We have lots of both around here, and they seem, at first, to share a niche.
Both birds are scavengers and clever, opportunistic feeders. However, it turns out that crows are more foragers, while ravens, hunters. In a small city or town, you might see both, but in fact, ravens tend to favour wilderness, while crows are attracted to people.
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.