D. Why birds have vocal muscles. 2. What do the underlined words “that risk” in Paragraph 4 probably mean? A. Defending territory. B. Impressing partners. C. Singing all to death. D. Threatening lives. 3. Which of the following agrees with Adam’s experiment conclusion? A. Regular si...
Like humans, birds have muscles and tendons that stretch over multiple joints, forming a pulleylike structure that can automatically move the connected bones in certain ways. But unlike human legs, which max out at having two joints connected this way, a bird limb’s muscles and tendons can ...
The short answer is thatthey do have bone marrow, just not in every bone. Birds bones are delightfully complicated things. Not every bone in a bird's skeleton is hollow. Most of their bones do develop cavities that lesson weight, and are connected to the respiratory system. What do birds ...
These owls also have thick rich plumage to help with the cold. This plumage often extends down to their talons. Still, it helps that the feathers only have to cover up skinny legs, instead of larger muscles. It’s An Illusion Owl legs, much like the legs of most other birds, are buil...
After a week, the birds’ singing muscles lost half of their strength. Three weeks later, they were back to the same level when they were juveniles (幼鸟) and never had sung before. When Adam played one of the male’s songs for: a group of female birds, six out of nine preferred th...
"Like, where you are an d where your territory is. " In a new study publishe d in the journal Nature Communications, Adam an d her co-workers offer a new explanation for why birds take that risk. They may have to sing a lot every day to give their vocal (声的) muscles the ...
Three weeks later, they were back to the same level when they were juveniles (幼鸟) and never had sung before. When Adam played one of the male’s songs for: a group of female birds, six out of nine preferred the song that came from a male who had been using his singing muscles ...
Do butterflies and birds have common ancestors since they both have wings? Similar Structures: Butterflies are a type of insect known for their large and colorfully patterned wings. Birds are a class of animals that also possess wings, with nearly every member of the group, with a f...
Lighter birds move up into the air effortlessly since less gravity is working on them. A bird rises by flapping, causing air to flow faster over the top of the wings. Flapping at a faster rate enables them to remain stationary in the air. Hearty has small wings and large muscles that...
After a week, the birds' vocal muscles lost half their strength. When she playe d a male's song for a group of female birds, six out of nine preferre d the song that came from a male that' d been using his singing muscles daily.Adam's findings are that " songbirds nee d to ...