Gulf Fritillary (Agraulis vanillae). A gulf fritillary sips nectar from an ironweed at Brackenridge Field Laboratory in… https://www.rawpixel.com/image/8720142/photo-image-flower-plant-public-domainFree Image from public domain licenseFlower pollen background, macro shot. Free public domain CC0 image. https://www.rawpixel.com/image/6028412/photo-image-background-flower-public-domainFree Image from public domain license