The Opioid crisis in USA and Canada. Digital. ©Sylvia Heredia
 Shakespearean Invaders of North America. Common starling ( Sturnus vulgaris) , house sparrow ( Passer domesticus) , and common cuckoo ( Cuculus canorus) . Watercolor and ink  Two of the most invasive species of birds in North America, starlings and house sparrows, where introduced in the late nineteenth century to honor Shakespeare. Most of his plays mention birds, which inspired Shakespeare fans to import them. Some introductions, such as the common cuckoo, were not successful.
 Endangered tree species of the world. Photomanipulation. ©Sylvia Heredia
 Multiple paternity in  Raphanus raphanistrum  plants. Photomanipulation. ©Sylvia Heredia
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