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This is Scientific American 60-second science.

I'm Emily Schweng. Urban development is encroaching on forests

in the Pacific Northwest, and it's also ruining Valentine's Day for some songbirds. Because urban

growth is making it a challenge for some birds like the Pacific Wren to stay faithful to their partners,

at least in Seattle. A housing boom is taking over the Wren's habitat, the thick forest

understory. So I really think it's just the fact that we kind of pull the rug out from underneath

these birds, take their forest away. John Marsliff, professor of wildlife science at the University of Washington.

While birds like crows and sparrows adapt well to human habitats,

Marsliff says that development is forcing the wren and other songbird species to find new digs.

And when that wren moves, it also abandons its mate. The work is in the journal,

Plus One. Marslift's decade-long study looks at six species in landscapes undergoing various

levels of development. If you don't go out for many years and follow individually marked birds,

you'll never really understand how nesting success over an

animal's lifetime or their strategies of moving and divorcing and finding new partners in places

plays out over their lifetime. The study shows that even after birds reestablish themselves elsewhere,

they have a harder time laying eggs and rearing

...