The birds are a combo of blackbirds and starlings. I twas explained to us that this is common when it's been dry and dusty. I guess the poop and dust build up and if we don't get any rain, it can cause a short which can catch on fire and fall to the ground (see picture 3, note the lit ember falling). These pictures were taken the day *after* the grass fire. It took Cal Fire coming out twice to motivate PG&E to fix the problem. PG&E came out, washed the pole and installed bird spikes, which the birds love, lol.
-Kathy