bay checkerspot butterfly (euphydryas editha bayensis) resting on a rock; classified as a federally threatened species, san

america area bay beautiful beauty blooming bright butterfly california chalcedona checkerspot colorful critically day delicate endangered euphydryas editha bayensis flowers fly fragile goldfields grass green insect lasthenia californica natural nature pollen pollination resting rock san francisco season seasonal small specie spread spring springtime sunny threatened time two vibrant vivid wild wildflowers wildlife wings yellow