Elvis, the polar bear pregnancy detection dog

Elvis, a 2-year-old beagle, checks out a camera lens while sniffing polar bear protein samples at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. The 2-year-old has been specially trained for a year by a Kansas handler who has taught dogs to sniff out everything from explosives to bed bugs. (AP Photo/Orlin Wagner)

Elvis, a 2-year-old beagle, sniffs polar bear protein samples at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. Confirming pregnancies of the massive bears, a threatened species, has been difficult, and zoo officials say knowing can help make sure they and the Mama bears are ready for birthing and raising cubs. (AP Photo/Orlin Wagner)

Polar bear protein samples await testing by Elvis, a beagle at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. (AP Photo/Orlin Wagner)

Elvis, a 2-year-old beagle, sniffs polar bear protein samples at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. The 2-year-old has been specially trained for a year by a Kansas handler who has taught dogs to sniff out everything from explosives to bed bugs. (AP Photo/Orlin Wagner)

Elvis, a 2-year-old beagle, sniffs polar bear protein samples at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Confirming pregnancies of the massive bears, a threatened species, has been difficult, and zoo officials say knowing can help make sure they and the Mama bears are ready for birthing and raising cubs. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. (AP Photo/Orlin Wagner)

Elvis, a 2-year-old beagle, enjoys a moment with Erin Curry at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis sniffs proteins from polar bears and is demonstrating 97% accuracy in positive identification of samples from pregnant females. The 2-year-old has been specially trained for a year by a Kansas handler who has taught dogs to sniff out everything from explosives to bed bugs. (AP Photo/Orlin Wagner)

Amy Grandgenett handles Elvis, a 2-year-old beagle, while sniffing polar bear protein samples at Iron Heart Performance Dog Center in Shawnee, Kan., Monday, Oct. 28, 2013. Elvis is demonstrating 97% accuracy in positive identification of samples from pregnant females. (AP Photo/Orlin Wagner)