An international research team led by Goethe University Frankfurt, Germany, determined that Troodon, a dinosaur very close to modern birds, was a warm-blooded animal (an endotherm), but had a reproductive system similar to that of modern reptiles.
Click here for original story, Analysis of dinosaur eggshells: Bird-like Troodon laid 4 to 6 eggs in a communal nest
Source: Phys.org