Fossils, embryos and other clues provide evidence that fish evolved before birds. The evolutionary record indicates that limbs and wings developed over millions of years after fish evolved.Know More
Approximately 400 million years ago, evidence indicates that lobe fish first came in to existence. Lobe fish are fish whose fins are bonier and contain more muscle than that of other fish, a precursor to limbs. Limbs evolved over tens of millions of years into creatures that were fully able to walk on land.
Feathers first appear in the known fossilized record about 150 million years ago and are currently thought to have evolved from the scales of reptiles.Learn More
Several animals on the African savannah work together to ensure survival, including baboons with impalas, zebras with wildebeests, oxpeckers with large animals and cattle egrets with buffaloes. Hyenas work together to hunt in packs for the mutual survival of the group, and lionesses hunt in much the same manner as they attempt to bring down zebras, gazelles and wildebeest.Full Answer >
Nineteen of the 20 species of armadillo are native to Latin America, with the other species, the nine-banded armadillo, being native to the United States. Armadillos are considered a threatened species as of 2014.Full Answer >
There are two sets of muscles that help annelids move. One expands, and the other contracts the body. Annelids alternate the use of these muscles to achieve locomotion.Full Answer >
Primary consumers feed solely on plants.Their food consists of leaves, grasses, fungus, flowering shrubs and other hedging plants. In the food chain, plants are the producers that are fed on by herbivores. Examples of primary consumers are cows, goats, antelopes, rabbits, giraffes and zebra.Full Answer >