CHINCOTEAGUE, Va. (AP)- The fire company that maintains the wild Chincoteague ponies on the island of the same name says a second pony has died of a disease named “swamp cancer.”

The Chincoteague Volunteer Fire Company says Rain Dancer died Monday. According to the fire company, the pony developed some ligament and tendon issues related to the disease before her death.

Rain Dancer’s death comes just over a month after 5-year-old Essie died after surgery, as her infection was “too far gone.”

“Swamp cancer” isn’t cancer, but rather pythiosis, caused by an organism similar to fungus.

Rain Dancer was less than a year old. She was first seen in late June.

Last week, the fire company said the ponies’ conditions had improved a lot, but warned that they weren’t out of the woods yet.

In all, seven ponies were originally affected.