Despite BP’s claims that the Gulf of Mexico is making a robust recovery in the wake of 2010’s Deepwater Horizon disaster, an annual study of the ecosystem and its inhabitants shows that the effects of the catastrophic explosion and subsequent oil spill are still being felt—and in many cases, are not yet fully understood.

April 20 will mark the five-year anniversary of the largest marine oil spill in U.S. history. And as the National Wildlife Federation notes in a report released Monday, “wildlife are still struggling” to rebound throughout the region’s deep waters, sandy beaches, lush wetlands, and coral reefs.

Among the findings detailed in NWF’s (pdf):

• In 2014, dolphins on the Louisiana coast were found dead at four times historic rates, and there is increasing evidence that these ongoing dolphin deaths are connected to the 2010 oil disaster.
• Twelve percent of the brown pelicans and 32 percent of the laughing gulls in the northern Gulf are estimated to have died as a result of the BP oil spill.
• Oil and dispersant compounds have been found in the eggs of white pelicans nesting in three states—Minnesota, Iowa, and Illinois.
• Exposure to oil has been shown to cause abnormal development in many species of fish, including mahi-mahi, Gulf killifish and bluefin and yellowfin tuna.
• Coral colonies in five separate locations in the Gulf—three in the deep sea and two in shallower waters—are showing significant oil damage.
• Oil has been found in sediments deep in the Gulf of Mexico, in a 1,200-square-mile area surrounding the wellhead.

“It may take years or even decades before the full impacts are known, and more research is clearly needed,” reads the report. “In the meantime, restoration of the Gulf ecosystem must become a high priority for the nation.”

The NWF’s report directly contradicts the sunnier outlook BP is attempting to project.

As the Guardian notes, “Over the last month, the company has released PR materials that highlight the Gulf’s resilience, as well as a report compiling scientific studies that suggest the area is making a rapid recovery.”