Small dog killed by mountain lion in North Boulder

A 161-million-year-old Stegosaurus is expected to sell at Sotheby’s for between $4 and $6 million

Scientists complete necropsy on deep-sea oarfish discovered in La Jolla

Dash cam shows part of Boulder dog attack

The secret to Kentucky Derby success? Horses' big hearts, powerful lungs and hind legs like springs

Doctors combine a pig kidney transplant and a heart device in a bid to extend woman's life

Study finds nanoplastics linked to stroke, heart attack and death

Scientists observe wild orangutan using a medicinal plant to treat a wound

Savannah Bananas coming back to Tampa with cruise

Drone footage shows humpback whale swimming with no tail in Washington state