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Wiki Draft (Invasive species in Puerto Rico):

Birds:

 * Columba livia: more commonly known as the rock pigeon, is an invasive bird brought in from early European movement through the Carribean. The species typically has a grey body with a white colored rump, but the body color can vary between gray, white tan, and brown . Throughout history, this animal was bred and used for a multitude of activities including homing and competitive racing . In modern times, they are more commonly utilized as a pastime, where people enjoy feeding and watching them . This particular bird can adapt to live in a variety of environments, including farm yards, grain elevators, feed mills, parks, city buildings, bridges, and more. Rock pigeons have been known to transmit diseases such as salmonella, food poisoning, cryptococcosis, toxoplasmosis, and more. The droppings of rock pigeons can also lead to increased deuteriation of building material, causing issues for urban areas within Puerto Rico.

Plants:

 * Abrus precatorius: Is a flowering plant better known as "jequirity bean" or "rosary pea" which is notorious for invading warm tropical areas . This nitrogen fixing plant is known to alter soil nutrients and heavily impact native species via allelopathic effects . At the end of the twentieth century, it was declared an invasive weed by Puerto Rico and much of the Carribean Islands . Once this plant has fully matured, their roots become difficult to remove, adding to this weeds notoriety . The most common removal method was using herbicides such as glyphosate, causing other unintended drawbacks on ecosystems which were invaded . Native species and humans also have to worry about consuming this plant, as it contains toxins which can be detrimental to their health with enough consumption.