Last week, a female killer whale was spotted off the coast of Washington State pushing the body of her dead newborn calf. The orca, known as Tahlequah, was observed doing the same thing in 2018 after another of her calves died in infancy. On that occasion, Tahlequah pushed the body of her offspring for 17 days, continually retrieving it and preventing it from sinking – an incredible feat given the fact that killer whales can travel an average of 120km (75 miles) a day.