Why do bees buzz constantly around the birch trees?

Irvine, CA

This is in Southern California. I believe the trees are birches - they have white bark and hanging green reproductive parts (flowers?) Every time I walk by one of these planted in the neighborhood, there's a huge crowd of bees buzzing around. I'm just curious what the bees are drawn to.

Prairieville, LA(Zone 9a)

The bees are probably attracted to the catkins (reproductive parts) for pollen/nectar. I would imagine even in CA there is not a whole lot of stuff in bloom right now.

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