Populations of black bear in particular are spiraling upwards in many parts of the northern half of the U.S., as roads, homes and camping spots infringe on bear territory. iStockphoto hide caption
Surprise! Not one of these things contains a single speck of blue pigment. Evan Leeson/Bob Peterson/lowjumpingfrog/Look Into My Eyes/Flickr hide caption
Fishermen Ed Stewart (left) and Tannis Goodsen mend groundfishing nets on Merrill Wharf, in Portland, Maine, last November. Robert F. Bukaty/AP hide caption
One of these penguins is not like the others — the chick in front is really a rover, designed by filmmakers and used by scientists to gather data. Huddle/John Downer Productions/BBC hide caption
A python embryo turns its leg cells into a pair of penises. Researchers now believe that signals from the embryonic gut trigger the development of the penis in many different species. Patrick Tschopp/Harvard Medical School/Department of Genetics hide caption
David Roberts says the Cyber-Enhanced Working Dog harness will allow humans to monitor dogs' physical and emotional states remotely, such as in search and rescue operations. Becky Kirkland/North Carolina State University hide caption
The Smithsonian's Jon Blundell scans the fossilized foot bone — the metatarsal — of the Wankel T. rex to help create a digital 3-D image of the long-dead dinosaur. Nikki Kahn/The Washington Post hide caption
An adult spotted lanternfly is seen, its wings spread to show a colorful hind wing. The invasive pest has sparked a quarantine in Pennsylvania. Holly Raguza/Pennsylvania Department of Agriculture hide caption
Nepal's sacred goats are escorted to a field to grab a bite. Luckily for them, they will never become a bite. Donatella Lorch hide caption
The Bracken Bat Cave outside San Antonio is home to millions of bats. Here, a few of them emerge from the colony in 2011. Eric Gay/AP hide caption
Caribous doing their business in mountain ice have left a viral record hundreds of years old. Courtesy of Brian Moorman hide caption
"Even as a paleontologist, I imagine them fighting, I imagine them roaming around; they still fuel my imagination." - Jack Horner James Duncan Davidson/TED hide caption
Christy Redd is the co-owner of America's largest alligator leather tannery. Zach Wolfe/Ozy.com hide caption
Reconstruction of Deinocheirus mirificus. Yuong-Nam Lee/Korea Institute of Geoscience and Mineral Resources hide caption
A puppy waits at an adoption event in Miami last year. The city is now considering a ban on the sale of puppies in retail pet stores. Cities and towns in several states have passed similar bans, aimed at cracking down on substandard, large-scale puppy breeders. Wilfredo Lee/AP hide caption
