Later signs and symptoms may include: 1  Fever. 2  Headache. 3  Nausea. Vomiting. 4  Agitation. Anxiety. 5  Confusion. Hyperactivity.  Difficulty 1  swallowing. Excessive salivation.  Fear of water (hydrophobia) because of the difficulty in 1  swallowing. Hallucinations.  Insomnia. Partial paralysis.
Some people consider the caterpillars of this butterfly to be a pest, since they eat parsley, carrots, and other garden plants. Many people enjoy butterfly-watching and collecting, and the Eastern Black Swallowtail is considered by most to be a handsome specimen.he Eastern Black Swallowtail is a common swallowtail butterfly, often confused with the Pipevine Swallowtail or female Tiger Swallowtail. Both male and female Eastern Black Swallowtails are bluish-black with yellow spots on the wings.
As swallowtail butterflies are large, colorful, and attractive, they were once targeted by butterfly collectors. The largest of these, the birdwing butterflies are particularly sought after and are cultured in butterfly farms for the purpose of collectors. Many members of the family feed as larvae on plants of the citrus family, Rutaceae.