2012-02-12 Vienna II. (and XXII.) district - Danube river, Donaustadtbrücke (155 msm Quadrant 7764/4). Crows can't swim; they're resting on ice floes here, and even seem to have found some food there (or at least they were pecking away). Both C. corone
(Carrion Crow) and Corvus cornix
(Hooded Crow) are present here: the distribution line between both runs from north to south straight across Europe, separating central-western territory of the former from central-eastern territory of the latter, and Vienna is located exactly on this line (or, rather, a broader strip). You don't only find both species here but also all kinds of crossbreed - you can often see mixed couples of them, producing mixed offspring. As they're interbreeding more or less excessively (and successfully!) they've been subsumed under one species (Corvus corone) for some time, but it seems that currently they're again divided into two - possibly because they keep their gene pools separate for most of their territory, despite overlaps like you can see them here in Vienna. Here in this photo, for a change, you can see specimen of both species which seem to be of pure breed. See remarks about the ice jam here.