Birds have evolved to fill that ecological niche.
water, food, air
Air+Lizard= Bird
Egg + air = bird
Bird=Air+Lizard
food,shelter,water,air,sunlight
Lizard+Air
Lizard+Air
Air+Egg or Air+Lizard
Egg+air
make a bird happy!!=]=]
Egg+air
Air + Lizard = BirdAir + Energy = Storm Bird + Storm = Thunderbird