Germany is currently experiencing something for which the English have no nice expression. We call it a “mouse gradation year”. I was not able to find a catchy English term for “gradation year” – it’s what happens when a certain species showing population cycles reaches a peak year. On the other side, and to even the score, the German term “mouse” is rather unspecific compared to the repertoire the English-speakes have at their service. In German, if you are a rodent and you are smaller than – say – a human hand, you’re a mouse. You’re not a vole or a gerbil. If however you are a larger “mouse”-like rodent you are a rat. No “gophers” etc. required. The specificities of languages …  Anyway, so Germany this year is essentially filled with mice, like the one shown here, which – so far as I know – is a vole where you come from.


“I may be a Bank Vole or I may be something else, but I most definitely am a mouse!”

Now, it doesn’t take much to notice a “mouse gradation year”: of course you’ll simply see them, much more frequently than in non-gradational years. Or you’ll notice that the ground everywhere is riddled with more holes than the back wall of a gun range. Then of course, there are the predators. It’s not only the fact that you see more birds of prey than in “normal” years, they also show a different behaviour. The Common Buzzards, for example, who usually hunt by circling high above the landscape, will hover in kestrel fashion much more frequently. The kestrels, on the other hand, will more frequently hunt from low perches. And finally, there will be Marsh Harriers everywhere breeding in grain fields instead of reeds. Gotta be mouse gradation.

But of course the mammalian meat eaters will be happy too and reproducing like there’s no tomorrow. In Germany, our most common large mammalian predator is the Red Fox Vulpes vulpes. Foxes are very common in Germany and occur even within cities. However, they tend to be rather secretive due to hunting pressure (by humans, not too many wolves yet in Germany), and are therefore a rare sight especially in densely populated areas. Of course this secretive nature of the foxes is challenged in mouse gradation years by the hunger of their abundant off-spring, and the parents are thus obligued to start hunting earlier in the evening and continue well into the morning. Sometimes, red foxes can even be observed hunting during the day when rodents and fox babies are plentiful.

I can’t think of many sights more entertaining than a red fox scouting a meadow in search of mice – or gophers, voles, gerbils – well, mice in a German sense. Now, I fully appreciate that Germany’s small furry rodents may have a differing perception, but to me a hunting fox resembles a playful puppy, walking about a green meadow with no other purpose than finding entertainment in curiosity, sniffing around and jumping in an overly energetic and elegant way at everything and anything that moves – just for the sake of showing off its mad jumping skillz. If “everything and anything” happens to taste nice, so much the better. If not, the fun of the jump was still worth the effort.

Mouse gradation rules.


fox jump 2


fox 1


fox 2


fox 3


fox 4


fox 5


fox 6


fox 7


fox 8


Written by Jochen
Jochen Roeder was born in Germany and raised to be a birder. He also spent a number of years abroad, just so he could see more birds. One of his most astounding achievements is the comprehension that Yellow-crowned Night-herons do not exist, as he failed to see any despite birding in North America for more than two years. He currently lives near Heidelberg, one of the most boring places for a birder to live, a fact about which he likes to whinge a lot. When he is not birding or trying to convince his teenage son that patiently scanning some fields for migrants is more fun than staring at a smartphone, he enjoys contemplating the reasoning behind the common names of birds. He first became famous in the bird blog world on Bell Tower Birding.