close up of a variable checkerspot butterfly drinking nectar from a rose clover wildflower, napa valley, california

america area bay beautiful butterfly california chalcedon chalcedona checkerspot close clover colorful contrast day delicate detail drinking euphydryas flower fly grass green insect macro meadow napa native natural nature nectar open park perched pink pollen pollinating posing purple rose season spring states sunny sunshine united valley variable vibrant vivid warming wild wildflower wildlife wings