What food source overwhelmingly dominates the Ruby-crowned Kinglet's diet for the vast majority of the year?

Answer

Tiny animal protein, specifically insects and spiders

For most of the year, the diet of the Ruby-crowned Kinglet is overwhelmingly composed of small arthropods such as insects and spiders.

What food source overwhelmingly dominates the Ruby-crowned Kinglet's diet for the vast majority of the year?
foodbirdKinglet