Flying animals have evolved wings for independent air movement. Birds use asymmetrical feathers for flight. Bats flap webbed wings with fingers for flight. Insects flap wings using indirect muscle movement
Marsupials are mammals with pouch-covered nipples and premature birth. Over 250 species exist, with 200 in Australia and 70 in Americas. Size ranges from 12 cm planigales to 2 meters red kangaroos
Microraptor was the smallest raptor, measuring about two feet long. Dilong was the smallest tyrannosaur, weighing only 25 pounds. Europasaurus was the smallest sauropod, weighing under 2,000 pounds. Aquilops was the smallest horned dinosaur, weighing only three pounds. Minmi was the smallest armored dinosaur, weighing 500 pounds
Zoo animals are species kept for public viewing and conservation. List includes 250 different animal species. Animals are categorized by species: reptiles, mammals, birds, fish, amphibians
Flying squirrels are a tribe of 50 species in the family Sciuridae. They cannot fly but glide between trees using a patagium. Their long tails provide stability during gliding. They have specialized cartilage in their wrists for gliding control
Female organisms produce larger ovum cells during sexual reproduction. Females and males are result of anisogamous reproduction system. Most mammalian females have two X chromosomes. Mammalian females produce milk through mammary glands