Science: The Patient Naturalist

On either side of the Danube, in the Altenburg district of Lower Austria, there is a stretch of dense willow forests, impenetrable scrub, reed-grown marshes and drowsy backwaters. Red and roe deer, herons and cormorants hunt there. Muskrats come down from Bohemia, and heavy-bodied stags recall the days when Francis Joseph I imported wapiti from America for the royal hunt.

There, on a hot summer day, two naturalists were trying to photograph a flock of greylag geese, but some inquisitive little mallards kept getting in the way. The photographer was doing his best to...

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