The bird is NOT a raven. It's a male Turdus merula, the common blackbird. I sourced the image to this page using a reverse lookup engine:
http://en.wikipedia.org/wiki/Intraspecific_competition
Intraspecific competition is a particular form of competition in which members of the same species vie for the same resource in an ecosystem (e.g. food, light, nutrients, space). This can be contrasted with interspecific competition, in which different species compete.
For example, two trees of the same species growing close together will compete for light, water and nutrients in the soil. Getting less resources, they will perform more poorly than if they grew by themselves (for example lowered growth rates and fewer seed output). Trees have therefore adapted to grow taller or develop larger root systems through natural selection.
Stern may be making comparisons to the Stern vs. JJP competition, and I wouldn't be surprised if this is a form of war cry. They may not be hinting at the next game at all.