Thirteen dead bald eagles were found Saturday on a farm and in a woods in Federalsburg.
PHOTO: Maryland Natural Resources Police
Thirteen dead bald eagles were found Saturday on a farm and in a woods in Federalsburg.
Now playing
01:50
Bald eagles found dead in Maryland
A1 OPEN-TRUMP VS MCCAIN/CHILDREN'S ADVIL RECALL/WHY WAS THE STATUE OF LIBERTY EVACUATED?-LT  A4-GREGORY ON TRUMP VS MCCAIN-TC  A19-ROSE MCGOWAN SIDES AGAINST ASIA-EG  A12-CHILDREN'S ADVIL RECALLED-TD  A98-MEXICO TRADE DEAL-WHAT IT MEANS FOR US-ED  A98-3D GUNS BLOCKED AGAIN-ED    B1-MEXICO TRADE DEAL-ED  B3-TOSS BIZ-EF  B4-$$STUDENT LOAN GUY QUITS-JW  B98-GAME OF THRONES 1ST LOOK-EG    C8-CUBS FAN-FOUL BALL IN BEER-JL  C10-POP NEWS-ALEC BALDWIN IN JOKER FILM-EG  C12-TRENDING-PAINTING PANDA-AA  C14-HL: EA CANCELS/SECURITY REVIEW-LT  C14-HL: NKOREA-DENUKE TALKS-LT  C15-TRUMP VS MCCAIN-ATHENA JNES-TC  C98-MATRESS MACK ANNIVERSARY-TC  C98-MYSTERY WOMAN DOORBELL-TC    D1-GOOD MORNING SOMEWHERE-SJ  D3-CROSS COUNTRY TOSS-TD  D3-XC3-MATRESS MACK-HARVEY ANNIV-TC  D98-NEW NEXT HOUR-DRAKE GIRL GETS HEART-EG    E01-RED TIDE FISH KILL OVER-ED  E3-OFFICER RESCUES FAMILY FROM FIRE-AA  E98-KANSAS MASCOT JOKES-JL  D99-SALUTE TO KIDS-SJ    F7-KANSAS MASCOT JOKES
PHOTO: CNN HLN
A1 OPEN-TRUMP VS MCCAIN/CHILDREN'S ADVIL RECALL/WHY WAS THE STATUE OF LIBERTY EVACUATED?-LT A4-GREGORY ON TRUMP VS MCCAIN-TC A19-ROSE MCGOWAN SIDES AGAINST ASIA-EG A12-CHILDREN'S ADVIL RECALLED-TD A98-MEXICO TRADE DEAL-WHAT IT MEANS FOR US-ED A98-3D GUNS BLOCKED AGAIN-ED B1-MEXICO TRADE DEAL-ED B3-TOSS BIZ-EF B4-$$STUDENT LOAN GUY QUITS-JW B98-GAME OF THRONES 1ST LOOK-EG C8-CUBS FAN-FOUL BALL IN BEER-JL C10-POP NEWS-ALEC BALDWIN IN JOKER FILM-EG C12-TRENDING-PAINTING PANDA-AA C14-HL: EA CANCELS/SECURITY REVIEW-LT C14-HL: NKOREA-DENUKE TALKS-LT C15-TRUMP VS MCCAIN-ATHENA JNES-TC C98-MATRESS MACK ANNIVERSARY-TC C98-MYSTERY WOMAN DOORBELL-TC D1-GOOD MORNING SOMEWHERE-SJ D3-CROSS COUNTRY TOSS-TD D3-XC3-MATRESS MACK-HARVEY ANNIV-TC D98-NEW NEXT HOUR-DRAKE GIRL GETS HEART-EG E01-RED TIDE FISH KILL OVER-ED E3-OFFICER RESCUES FAMILY FROM FIRE-AA E98-KANSAS MASCOT JOKES-JL D99-SALUTE TO KIDS-SJ F7-KANSAS MASCOT JOKES
Now playing
00:53
Police search for 'distressed' mystery woman
new clue D.B. Cooper manhunt_00002709.jpg
PHOTO: CNN
new clue D.B. Cooper manhunt_00002709.jpg
Now playing
00:45
Clue may lead to new D.B. Cooper details
This picture taken on November 24, 2015 shows coast guard officials investigating a wooden boat at the Fukui port in Sakai city in Fukui prefecture, western Japan after the ship was found drifting off the coast of Fukui. Japan is investigating nearly a dozen suspicious boats recently found drifting off the country's coastline, some with decaying bodies aboard, officials said on November 27, as media speculated they came from North Korea. At least 11 cases involving wooden boats -- some badly damaged -- with 20 bodies on board have been reported during October and November.
PHOTO: JIJI PRESS/AFP/AFP/Getty Images
This picture taken on November 24, 2015 shows coast guard officials investigating a wooden boat at the Fukui port in Sakai city in Fukui prefecture, western Japan after the ship was found drifting off the coast of Fukui. Japan is investigating nearly a dozen suspicious boats recently found drifting off the country's coastline, some with decaying bodies aboard, officials said on November 27, as media speculated they came from North Korea. At least 11 cases involving wooden boats -- some badly damaged -- with 20 bodies on board have been reported during October and November.
Now playing
00:58
'Ghost ships' full of dead bodies found near Japan (2015)
PHOTO: Sergei Khomenko (FAO)
Now playing
01:14
What is behind 120,000 recent antelope deaths?
mysterious face etched in cliff dnt canada_00001521.jpg
mysterious face etched in cliff dnt canada_00001521.jpg
Now playing
01:32
Mysterious stone face found etched in a cliff
orig tokyo aquarium tuna fish deaths_00001506.jpg
PHOTO: TV Asahi
orig tokyo aquarium tuna fish deaths_00001506.jpg
Now playing
01:00
1 lonely tuna all that remains in massive aquarium
idesk siberia mystery craters rtv _00000316.jpg
PHOTO: Reuters
idesk siberia mystery craters rtv _00000316.jpg
Now playing
02:06
Gigantic crater opens up here ...
pkg soares uk tjipetir blocks mystery_00011522.jpg
pkg soares uk tjipetir blocks mystery_00011522.jpg
Now playing
02:07
Mystery objects wash ashore in Europe
While it was posted that the substance is likely ash is from Volcano Shiveluch, they are a number of volcanoes that are currently active. The source of the material has not been scientifically confirmed. According to a story posted by The Spokesman Review: "One meteorologist speculated that the dirt was volcanic ash that got into the atmosphere from Mexico." We have received reports of 'white stuff' on vehicles. The ash is more than likely from Volcano Shiveluch in Kamchatka Krai, Russia, which spewed an ash plume to about the 22,000-foot level in late January. It has been deposited in a wide spread area, including Washington and Oregon.
While it was posted that the substance is likely ash is from Volcano Shiveluch, they are a number of volcanoes that are currently active. The source of the material has not been scientifically confirmed. According to a story posted by The Spokesman Review: "One meteorologist speculated that the dirt was volcanic ash that got into the atmosphere from Mexico." We have received reports of 'white stuff' on vehicles. The ash is more than likely from Volcano Shiveluch in Kamchatka Krai, Russia, which spewed an ash plume to about the 22,000-foot level in late January. It has been deposited in a wide spread area, including Washington and Oregon.
Now playing
01:21
Weather mystery in Washington state
pkg wcvb mystery man shovel boston marathon_00001201.jpg
pkg wcvb mystery man shovel boston marathon_00001201.jpg
Now playing
01:17
Mystery man who shoveled Boston's finish line ID'd
pkg burke paris drone mystery_00001009.jpg
pkg burke paris drone mystery_00001009.jpg
Now playing
02:03
Mysterious drone sightings in Paris cause concern
Berman Roots Pkg Newday _00061720.jpg
Berman Roots Pkg Newday _00061720.jpg
Now playing
09:21
John Berman solves family mystery in Amsterdam
pkg elam obsessed with mystery_00011026.jpg
PHOTO: Getty Images
pkg elam obsessed with mystery_00011026.jpg
Now playing
02:18
Real life mysteries that keep us wondering
nr intv keilar bill nye rosetta mission comet landing_00000924.jpg
nr intv keilar bill nye rosetta mission comet landing_00000924.jpg
Now playing
02:30
Comet mission may solve age-old mystery
ath amelia earhart new clue_00012326.jpg
PHOTO: AFP/Getty Images
ath amelia earhart new clue_00012326.jpg
Now playing
03:32
This clue may help solve Earhart mystery

Story highlights

Center for Biological Diversity pledges $15,000, raising reward total to $25,000

A man searching for shed deer antlers stumbled across the carcasses of four bald eagles; officials discovered nine more

U.S. Fish and Wildlife Service officials are still investigating the cause of death at a forensics center in Oregon

(CNN) —  

After the discovery of 13 dead bald eagles in rural Maryland, animal protection groups have pledged up to $25,000 as a reward for information leading to an arrest and conviction, according to the Center for Biological Diversity.

The activist organization said Wednesday that it is offering up to $15,000. Three other groups, along with the U.S. Fish and Wildlife Service, have pledged a total of $10,000, the federal agency said.

Four of the dead eagles were found by a man who was searching a field for shed deer antlers Saturday near Federalsburg, in Maryland’s Eastern Shore near the Delaware border, according to Maryland Natural Resources Police spokeswoman Candy Thomson.

He called the state agency, and wildlife officers found nine more carcasses after searching the area, Thomson told CNN.

It is “the largest die-off in one area in Maryland in 30 years,” Thomson said, citing an incident in which eight bald eagles were found dead of suspected poisoning, though testing did not provide conclusive answers.

The cause of death in this die-off is still unknown.

The federal wildlife agency took over the investigation and sent the carcasses to its forensics lab in Oregon, according to spokeswoman Catherine Hibbard. She told CNN it is the only facility of its kind.

The agency will release a report, including cause of death, within the next few weeks, Hibbard said.

Though bald eagles are no longer listed as an endangered species, they are protected under the Bald and Golden Eagle Protection Act and the Migratory Bird Treaty Act, which penalize those who harm the birds with fines up to $100,000 and possible imprisonment of up to one year, according to the Fish and Wildlife Service press release.

Other groups that have pledged funds for a reward are the Humane Society of the United States, the Humane Society Wildlife Land Trust and the Phoenix Wildlife Center, Hibbard said.