2007-06-05 10:47:04 · 31 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
pengium
2007-06-05 11:12:16 · answer #1 · answered by Anonymous · 1⤊ 1⤋
Kiwi. Penguin. Cassawary. Those are the 3 most popular.
There are about 40 flightless species of birds living today. All of these evolved from ancestors that flew and most evolved in the absence of predators. There are two key differences between birds that fly and those that can't:
The wing bones of flightless birds are relatively small.
Flying birds have a keel on their breastbone. The keel anchors the strong muscles that move a bird's wings during flight. Flightless birds have a flat breastbone or a greatly reduced keel.
Flightlessness is an adaptation that usually evolves on islands where predators are absent. However, not all flightless birds are found on islands. Ostriches live on the African savannas. Since ostriches can't fly away to escape predators, ostriches have evolved another defense. Ostriches can use the claws on their feet as dangerous weapons when threatened.
2007-06-05 10:51:09 · answer #2 · answered by bluesdude2765 2 · 1⤊ 1⤋
Penguins
2007-06-05 10:50:57 · answer #3 · answered by slimdude142 5 · 0⤊ 1⤋
Penguins
2007-06-05 10:50:19 · answer #4 · answered by mejulie350 2 · 0⤊ 1⤋
Penguins
2007-06-05 10:48:45 · answer #5 · answered by biologist1968 2 · 0⤊ 1⤋
Penguin
2007-06-05 10:49:44 · answer #6 · answered by Jacques 5 · 0⤊ 1⤋
Penguin
2007-06-05 10:49:31 · answer #7 · answered by Anonymous · 0⤊ 1⤋
Penguin
2007-06-05 10:49:18 · answer #8 · answered by Tony D 2 · 0⤊ 1⤋
Penguin
2007-06-05 10:49:11 · answer #9 · answered by Dave aka Spider Monkey 7 · 0⤊ 1⤋
Penguin
2007-06-05 10:49:07 · answer #10 · answered by tjnw79 4 · 0⤊ 1⤋
Seventeen species of penguins, Falkland Flightless Steamer Duck, Flightless Cormorant (Galapagos Islands), Junin Flightless Grebe, White Headed Flightless Steamer Duck, Titicaca Flightless Grebe, Magellanic Flightless Steamer Duck.
2007-06-05 10:51:12 · answer #11 · answered by Anonymous · 1⤊ 1⤋