Please help me on this one. Are they saying that a dino was laying bird eggs?
The point in the article was how the eggs were carried and laid. Reptiles produce many eggs simultaneously. Multiple eggs are formed in fallopian tubes in reptiles like alligators. Birds produce one egg at a time in one fallopian tube. The dinosaur fossil in the article is interesting because it produces only one egg (like birds) in each fallopian tube (like reptiles). It is a blend of both reproductive systems. It also explains why eggs found in dinosaur nests appear arranged in pairs (two laid at a time) but are not paired up in reptile or bird eggs. Reptiles laid many at a time, birds lay single eggs at a time and lay a second (or third, etc.) after that egg develops individually in the bird.