Tahlequah, the Southern Resident orca who carried her dead calf for 17 days in 2018, is mourning the loss of another newborn, raising concerns about her health.

An endangered orca mother has been carrying her dead newborn calf on her snout for nearly a week around Washington’s Puget Sound.

The calf was born in late December. Observing researchers noted unusual unspecified behaviors by mother and calf that led them to worry for the young whale’s health.