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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Birds in Europe have the same problem as residents of cities like New York in L.A., a housing crisis.

Not enough nest space to go around. For a species called pied flycatchers that migrate from West Africa,

things can get deadly if they end up nesting in the wrong spot.

There's no chance for them.

Yelmer Samplonius is a climate change ecologist at the University of Edinburgh.

He says the flycatchers face fearsome foes in the form of bigger resident songbirds called Great Tits.

The great it basically splits open the skull at the back and eats the brain.

That's the gist of it.

Samplonius and his colleague Christian Both recorded more than a decade's worth of those

conflicts in nearly a thousand nest boxes in the Dutch countryside.

They determine that warmer winters can boost resident great tit numbers, increasing the chance

of flycatcher slaughter.

But warmer springtime temperatures

can throw the two species nesting times out of sync, which would actually reduce deadly conflict.

In addition, over the past 30 years, male flycatchers seem to be arriving earlier and earlier,

regardless of springtime temperature trends. In other words, it's complex.

...