This is Bird Note.

If you know how to distinguish it, the song of the red warbler is enough to tell you whether the morning is clear.

No need to get out of bed or check the weather forecast.

During the breeding season, between February and May, they happily sing on sunny mornings.

But if it's cloudy, they won't sing, no matter the season.

So this is what a clear morning sounds like.

Red warblers are the tiniest weather station you can imagine, barely five inches long and weighing less than a triple A battery.

They're endemic to the highlands of Mexico, so to hear them, you have to venture into the humid forests of pine, oak, and fir.

Although you can spot red warblers in a large part of the country's territory, they don't travel between states.

When taking care of their offspring, both parents care for their chicks.

But they approach their nests only

for a few seconds to avoid attracting predators. It's just one of their tricks for survival.

Although there is evidence of a slight decline in their populations, it's not a drastic one,

so hopefully we'll have our little weather stations around for a long time.

For Bird Note, I'm Lucina Malesio.