CHICKEN
This theory of lizards laying eggs and out comes a chicken is a nice tale to tell your children so the sleep well and do their homework. But it doesn't withstand scientific examination.
Upfront - I can see a chicken loosing its feathers or learning to fly through evolution. It's not that different from breeding dogs after all.
But now consider this:
Even if we take nothing into account but the genes there's only so and so many that produce a healthy chicken. The vast majority of possible mutations would not even produce something that could survive for two seconds. In other words the chance that a lizard mutates into a chicken is so infinitely small that it'd would take half your life to even read the number. We've never witnessed a species evolving into another. Heck, if you are a white man with a white wife and your child is black could she tell you some stories about mutation? And that's easy.
And even if that happens (it won't) we have only one chicken. How's that gonna mate? Assuming it isn't eaten in the first place, because whatever improvement those wings are over the legs, chickens are still eaten 9 times out of 10.
But maybe it's all done in small steps ... like maybe a lizard gets some feathers and then the feathered lizards thrive and multiply and then one of those grows a beak (if genetics were that simple...), and the beaked feathered lizard multiplies and one of them learns to stand up on his hindlegs... We'd be knee deep in strange monsters if it worked that way. Well, we aren't, even if a lizard got feathers, it'd be still a lizard and no more survivable. On the contrary, someone mistakes it for a chicken and eats it. He can only tell by the taste.
For anyone who can cast of his bias for a moment the answer is obvious.
Fish rain.
Well, you know when sometimes it's raining fish or frogs ... well, one day it rained chicken.