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Doctors in the Indian capital, Delhi, have performed a life-changing surgery on a 17-year-old boy to remove his "parasitic" twin that was attached to his abdomen.

California wildlife officials also recently reported that the state’s southernmost wolf pack in Tulare County is suffering from sarcoptic mange, a disease caused by parasitic mites that can cause itchy skin lesions and hair loss.

A new tablet being developed to cure intestinal worms has shown promising results in trials and could help eradicate the parasitic infection, which affects about 1.5 billion people globally, researchers say.

The tiny parasitic spider-like creatures are usually active from early spring to late autumn.

Over centuries, these alliances have taken many forms — some enhancing economic development while others extracting parasitic rents.