Hummers swarming in Alpine

I'm used to hummers swarming in late summer as they build up their fat reserves in preparation for migration, but it's surprising to see them buzzing frenetically in May. (All Black-chinned Hummingbirds.)

I panicked and put out more and bigger feeders.

I'm not sure why the influx, maybe some are recently fledged. 

I'm sure glad I hung extra feeders at the oasis yesterday just in case it's the same there.