What are these spherical nest looking things on power lines in Mexico?

Post date: 2017-08-20 14:36:36
Views: 87
I just came back from San Miguel de Allende, where I saw a lot of these round things on power/phone lines. Here is a picture in context. Are they bird nests? Which birds?

I saw mainly three different types of birds while I was there in the city: pigeons; swallow looking birds with forked tails that swooped and flew low and fast through the streets and sort of crow looking birds with much longer tails than our crows. I know pigeons didn't make these! Did the swallows? I never saw a bird going in or out of one and they were too high up for me to see them closely.
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