The California Department of Fish and Wildlife announced that the mysterious gray goo that killed 170 seabirds along the eastern shore of San Francisco Bay last month contained a mixture of non-petroleum-based fats and synthetic oils. These include silicone fluids, tung oils, resin, as well as edible and inedible seed oils from plants. 

The department stated that its researchers have not yet determined the source of the material, which had degraded to a sticky, thick consistency that was very difficult to remove from the feathers of the affected birds. It severely compromising their ability to stay warm, float, fly and locate food.

The investigation continues. The department asks that anyone with information on the incident, call CalTIP at 888-334-2258.