I'm sure there must be some scientific reason why the sky is a more intense blue at lower latitudes. Or maybe that's so only in low latitude areas with low humidity. Whatever the case, the sky here in Oaxaca today was a glorious azure, with not a cloud in sight. Of course, that's not necessarily good news for reservoirs such as this one (a mere shadow of its former self) just above the famous weaving village of Teotitlán del Valle.
One of the day's treats was a gang of nine Boucard's Wrens that swarmed across a grassy field and bounced along a brick wall studded with protruding rebar. Talk about snazzy! Mexico is at the epicenter of wren evolution. The country has 31 species, including 11 found nowhere else in the world. That's more species of wren than are found in all of Europe and Asia combined!
The blue colour is because of the Rayleigh affect. I guess that the composition of the particles and molecules in the air affect how much light scattering there is, and the amount of humidity, with all those water molecules must change the colour.
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