National Wildlife Health Center

...advancing wildlife and ecosystem health

New and Ongoing Wildlife Mortality Events Nationwide

USGS and a network of partners across the country work on documenting wildlife mortality events in order to provide timely and accurate information on locations, species and causes of death.  This information is used by natural resource managers, researchers, public health officials and  legislators  to help design disease prevention and mitigation strategies, to address interconnections between human, domestic animal and wildlife disease, and to assist in identification of 'normal' disease issues vs. biosecurity concerns.

These data are not all-inclusive. Information on some outbreaks may not be received until months or years after the event, but efforts continue to make the information as complete as possible. For information on previous wildlife mortality events and events that used to be on this page, please see the Quarterly Mortality Reports.

New The Recent Mortality Events Map visualizes the data on this page in an interactive map. Watch for trends and filter events based on type and location.

For additional information on mortalities, contact the NWHC field epidemiology team at 608-270-2480 or

More information on reporting an event can be found at the event reporting page.

Date last updated : Dec 11, 2014

Mortality Begin Date End Date State County Species Diagnosis Estimated Mortality to Date Reported By
12/01/2014ongoingCASTANISLAUSRoss' GooseAvian cholera suspect~ 50USGS NWHC
12/01/2014ongoingWAWHATCOMMallard, American Wigeon, Northern Pintail, Northern Shoveler, Ruddy DuckOpen< 75USGS NWHC
11/26/2014ongoingUTSALT LAKEUnidentified Gull, Eared GrebeAvian cholera~ 6000USGS NWHC
11/26/2014ongoingAZMARICOPAGreat-tailed Grackle, Western Screech OwlOpen< 25USGS NWHC
11/24/2014ongoingAZMARICOPAMourning DoveOpen< 25USGS NWHC
11/21/2014ongoingCASUTTERRoss' Goose, American Wigeon, Lesser Snow GooseAvian cholera< 5USGS NWHC
11/10/2014ongoingTXHIDALGOEurasian Collared DoveViral Infection: pigeon paramyxovirus 1< 50USGS NWHC
11/03/201411/12/2014FLPINELLASRed KnotOpen< 25USGS NWHC
11/01/201411/06/2014LAOUACHITAAmerican Coot, Gadwall, Green-winged Teal, Unidentified DuckTrauma~ 150USGS NWHC
10/31/2014ongoingNYCHAUTAUQUA, ERIECommon Loon, Herring Gull, Long-Tailed (AKA Oldsquaw) Duck, Canada Goose, Bonaparte's GullBotulism suspect< 700NY Dept Env Cons
10/29/201410/31/2014PACHESTERCanada GooseOpen< 10USGS NWHC
10/26/2014ongoingORCOOSCassin's Auklet, Sooty Shearwater, Brandt's Cormorant, Common Murre, Western GullOpen< 50USGS NWHC
10/22/2014ongoingWILA CROSSEAmerican Coot, Lesser ScaupParasitism suspect< 250USGS NWHC
10/15/201410/15/2014OHMEDINAGreen FrogTrauma, Parasitism~ 200USGS NWHC
10/14/201410/14/2014AZYAVAPAIGambel's QuailOpen~ 10
10/12/201410/31/2014MDDORCHESTERDiamondback TerrapinUnsuitable~ 200USGS NWHC
10/07/2014ongoingMDKENTMallardUndetermined, Anemia, Airsacculitis~ 250USGS NWHC
10/06/2014ongoingCASONOMA, SAN LUIS OBISPO, MONTEREYCassin's AukletOpen~ 150USGS NWHC
10/03/201410/10/2014UTDAVISEared GrebePredation, Botulism type C< 25USGS NWHC
10/01/201410/29/2014NVWASHOEMallard, GadwallBotulism type C< 10USGS NWHC
10/01/2014ongoingUTUTAHMallard, DogToxicosis: blue-green algae suspect~ 100UT Vet Diagnostic Lab
09/29/201409/30/2014MAPLYMOUTHRock DoveViral Infection: pigeon paramyxovirus 1, Emaciation, Viral Infection: Circovirus suspect< 10USGS NWHC
09/20/201410/31/2014ORMULTIPLE COUNTIESCommon Murre, Rhinoceros AukletEmaciation: starvation suspect, Avian pox suspectunknownUSGS NWHC, OR State Diagnostic Lab
09/17/201409/20/2014LACADDOBlack VultureToxicosis: organophosphorus compound< 50USGS NWHC, SCWDS
09/15/201409/24/2014MIWAYNEMallardBotulism type C< 25MI Dept of Natural Resources
09/08/201409/11/2014MIMACOMBMallardBotulism type C< 10MI Dept of Natural Resources
09/06/2014ongoingMNHOUSTONAmerican CootParasitism suspect< 250USGS NWHC
09/02/201410/28/2014IDPAYETTEGreen-winged Teal, Unidentified Duck, American Coot, Unidentified Avian, Great Horned OwlBotulism type C~ 50USGS NWHC
09/02/201409/15/2014CAALAMEDADouble-crested CormorantEmaciation, Undetermined, Parasitism< 25USGS NWHC
09/01/201409/08/2014MIMONROEMallardBotulism type C< 25MI Dept of Natural Resources
08/26/201409/18/2014WIMILWAUKEEMallardBotulism type C< 25USGS NWHC
08/25/201409/15/2014MTPHILLIPSAmerican White Pelican, Gadwall, Unidentified Gull, Unidentified Duck, MallardBotulism suspect, Salmonellosis, Viral Infection: West Nile Virus suspect< 200USGS NWHC
08/24/201408/26/2014MIMACOMBMallardBotulism type C~ 10MI Dept of Natural Resources
08/24/201408/31/2014AZMARICOPAMallardBotulism type C< 25USGS NWHC
08/23/201408/26/2014MTPHILLIPSTree Swallow, Barn Swallow, Bank SwallowEmaciation: starvation suspect~ 25USGS NWHC
08/20/201408/31/2014IDTETONTiger SalamanderUnsuitable< 50USGS NWHC
08/19/201408/31/2014AKALEUTIANS EASTCommon Murre, Unidentified MurreUndetermined< 75- no diagnostics pursued -
08/18/201408/19/2014OHSANDUSKYRing-billed GullUndetermined< 25USGS NWHC
08/18/201410/15/2014AZMOHAVEEurasian Collared Dove, Rock DoveViral Infection: pigeon paramyxovirus 1 suspect, Unsuitable, Trauma: impact~ 150USGS NWHC
08/18/201409/01/2014MTSHERIDANCanvasback, Blue-winged Teal, Northern Shoveler, Mallard, American AvocetBotulism type C, Toxicosis: blue-green algae suspect~ 50CA Animal Health/Food Safety L, USGS NWHC
08/18/201408/18/2014TXCOLEMANHouse Sparrow, Unidentified Flycatcher (New World Only)Trauma: weather suspect~ 250USGS NWHC
08/15/201409/30/2014MTMULTIPLE COUNTIESGreater Sage GrouseOpen< 25USGS NWHC
08/14/201409/30/2014WAGRAYS HARBORCommon Murre, Western Gull, Glaucous-winged Gull, Rhinoceros Auklet, Greater White-fronted GooseEmaciation< 200USGS NWHC
08/10/201408/30/2014WAKINGBand-tailed PigeonParasitism: trichomoniasis suspect< 25- no diagnostics pursued -
08/06/201408/15/2014AZCOCHISELesser long-nosed BatPredation< 10USGS NWHC
08/05/201409/02/2014WACLARKMallard, Unidentified Duck, Killdeer, Unidentified Sandpiper, Unidentified DeerUndetermined< 25- no diagnostics pursued -
08/04/201410/04/2014NDMOUNTRAILAmerican White PelicanViral Infection: West Nile, Aspergillosis~ 50USGS NWHC
08/02/201410/31/2014NDSTUTSMANDouble-crested Cormorant, Canada GooseViral Infection: virulent Newcastle Disease, Salmonellosis, Aspergillosis~ 50USGS NWHC
08/01/201408/15/2014MNBIG STONERing-billed Gull, American White Pelican, Double-crested CormorantViral Infection: West Nile, Emaciation, Salmonellosis< 50USGS NWHC
08/01/201409/30/2014MNCASSDouble-crested Cormorant, Unidentified GullViral Infection: Avian Paramyxovirus 1 suspect< 100USGS NWHC
08/01/201409/19/2014KYMADISONEastern Box TurtleViral Infection: Ranavirus< 50USGS NWHC
08/01/201408/03/2014MIWAYNEMallard, MuskratBotulism suspect~ 10MI Dept of Natural Resources
08/01/201410/23/2014NVWASHOEMallard, Unidentified Gull, Common Merganser, Green-winged TealBotulism type C< 25USGS NWHC
07/30/201409/20/2014CAMULTIPLE COUNTIESBrandt's CormorantEmaciation, Necrotic enteritis~ 500USGS NWHC
07/30/201408/13/2014MIGRAND TRAVERSEMallardBotulism type C< 50MI Dept of Natural Resources
07/28/201407/28/2014PALANCASTERAmerican Robin, House Finch, Unidentified PasserineTrauma~ 150SCWDS
07/26/201410/08/2014CASACRAMENTOMallard, Hybrid Mallard DuckBotulism type C< 100USGS NWHC
07/25/201410/17/2014MDTALBOTDouble-crested CormorantSalmonellosis, Necrotic enteritis, Emaciation< 300USGS NWHC
07/21/201409/10/2014NVCLARKEurasian Collared DoveViral Infection: pigeon paramyxovirus 1, Parasitism: trichomoniasis< 25USGS NWHC
07/18/201407/18/2014WIWAUSHARABig Brown BatEmaciation< 10USGS NWHC
07/17/201408/05/2014MNFILLMOREBig Brown BatEmaciation< 75USGS NWHC
07/15/201409/30/2014MNMEEKERDouble-crested Cormorant, American White Pelican, Killdeer, Unidentified GullViral Infection: virulent Newcastle Disease, Avian cholera< 50USGS NWHC
07/15/201408/05/2014PAWESTMORELANDBig Brown Bat, Red Bat, Little Brown BatRabies< 10USGS NWHC
07/14/2014ongoingNVELKOEurasian Collared DoveViral Infection: pigeon paramyxovirus 1~ 75USGS NWHC
07/13/201408/01/2014MABARNSTABLECommon TernSalmonellosis< 100USGS NWHC
07/13/201407/14/2014NMMCKINLEYBrown-headed Cowbird, Red-winged Blackbird, House SparrowUndetermined~ 200USGS NWHC
07/09/201407/11/2014WIBURNETTLittle Brown BatUndetermined, Pneumonia< 50USGS NWHC
07/07/201408/02/2014CASAN BERNARDINOHybrid Mallard DuckBotulism suspect< 25- other -
07/04/201410/04/2014CASISKIYOUMallard, Green-winged Teal, Northern Pintail, Northern Shoveler, Unidentified AvianBotulism type C< 6850USGS NWHC
07/02/201408/21/2014VANEWPORT NEWSEvening BatEmaciation, Trauma, Parasitism< 25USGS NWHC
07/01/201407/31/2014WIVILASBullfrogViral Infection: Ranavirus~ 300USGS NWHC
07/01/201408/21/2014PALUZERNEBig Brown BatTrauma, Parasitism: renal coccidiosis< 25USGS NWHC
06/30/201407/31/2014AZPIMAPallid Bat, Brazilian Free-tailed BatEmaciation, Rabies, Parasitism: acanthocephaliasis< 75USGS NWHC
06/27/201411/08/2014MILEELANAU, BENZIECommon Loon, White-winged Scoter, Double-crested Cormorant, Ring-billed Gull, Long-Tailed (AKA Oldsquaw) DuckBotulism type E< 100USGS NWHC
06/20/201409/02/2014MDTALBOTMallard, Unidentified Shorebird, Unidentified Gull, Unidentified PasserineBotulism type C, Bacterial infection: Riemerella anatipestifer, Bacterial infection~ 200USGS NWHC
06/20/201407/14/2014CASAN DIEGOCalifornia Least (Little) TernStarvation< 50CA Animal Health/Food Safety L
06/20/201407/20/2014WYSHERIDANMountain BluebirdStomatitis< 50WY State Veterinary Lab
06/18/201409/15/2014AZMARICOPARosy-faced (Peach-faced) LovebirdChlamydiosis~ 75USGS NWHC
06/14/201408/15/2014MNBECKERMudpuppy SalamanderUndetermined< 25- no diagnostics pursued -
06/01/201408/15/2014MNBECKERMudpuppy SalamanderUndetermined~ 200- no diagnostics pursued -
06/01/2014ongoingCALOS ANGELESWestern Pond Turtle, Red-Eared Slider TurtleEmaciation: starvation suspect, Bacterial pneumonia and septicemia, Emaciation: anemia< 350USGS NWHC
05/26/201408/28/2014MTMUSSELSHELL, GOLDEN VALLEYGreater Sage GrousePredation, Undetermined, Emaciation< 10USGS NWHC
05/26/201407/27/2014PAMULTIPLE COUNTIESBig Brown BatMetabolic Bone Disease, Nutritional Deficiency: unknown etiology< 10USGS NWHC
05/04/201408/21/2014MSHARRISONDusky Gopher FrogParasitism: Perkinsus-like organism, Fungal Infection: Saprolegnia sp.< 50USGS NWHC
05/01/201411/20/2014CAMULTIPLE COUNTIESAmerican Crow, Western Scrub Jay, Yellow-billed Magpie, Steller's Jay, Common RavenViral Infection: West Nile, Undetermined, Aspergillosis~ 700CA Animal Health/Food Safety L, USGS NWHC
04/15/201407/15/2014SCMULTIPLE COUNTIESCommon (Black) Scoter, White-winged ScoterEmaciation, Trauma, Parasitism: Schistosomiasis~ 150USGS NWHC
02/09/201411/13/2014CAFRESNO, KERNMourning DoveParasitism: trichomoniasis< 200CA Fish & Game Disease Lab

Explanation of fields:

Mortality begin date is the date the mortality began -- for most wildlife disease events, this is an estimate only, as carcasses may not be noticed immediately.

End date is again usually an estimate of the last day new carcasses were found.

State and country identify the area in which the mortality is occurring.  NOTE:  avian mortality events may cover several counties and possibly multiple states given the migratory nature of many species.

Species shown on the table include up to 5 of the species involved in the event.  In some cases, group identifiers like 'waterfowl' or 'shorebirds' have been used instead of specific names when a large number of different species are involved.

Diagnosis includes a final diagnosis, if known, with no qualifiers; a suspected diagnosis once preliminary investigations have been made; or an indication that tests are still in process.  NOTE:  In some instances, where mortality occurred but no specimens were sent to NWHC or another diagnostic laboratory or -- in rare instances -- where tests could not definitely identify a trigger for the mortality, the cause of death may never be determined.  Such events are identified with the word 'undetermined' in the diagnosis column.

The estimated mortality provides some indication of the severity of the event.  Numbers may change rapidly from one week to the next.

The 'reported by' field indicates the lab(s) or agencies who reported or are working on the mortality event.

USGS NWHC = USGS National Wildlife Health Center
USDA NVSL = USDA National Veterinary Services Lab
SCWDS = Southeastern Cooperative Wildlife Disease Study

NOTE: If you find a dead bird, mammal, reptile or amphibian, please contact your state natural resource agency first.  They will know the proper reporting procedures for your area.  Contact information may be found online or in the government pages of your local telephone book.

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