Question 4

Question 4

Now read a passage about Birdsong. You will have 45 seconds to read the passage. Begin reading now.

Now listen to part of a lecture on this topic in a zoology class.

They’re actually a couple of physiological differences which alone male songbirds to produce more complex songs and then there is that female songbirds.

First, there is a difference in the song producing parts and songbird brains.

It all comes down to part called the robust is orchestra Tellus or RA. This isn’t area of the brain responsible for sound production bearings.

As it turns out the size of the Iranian male songbirds is significantly larger than those in female songbirds

In zebra finches the RA is at least five times larger in males than in females, so male buried simply have a better ability to produce signs because they have bigger sound producing mechanisms.

There is also a difference in the amount of the hormone or chemical substance found in the brains of male and female songbirds.

This hormone is produced outside of the brain and many species.

However, the male songbird’s brain is able to produce this hormone on its own.

Interstate portions of male songbirds’ brains were observed to produce this hormone.

Male songbirds have more of this hormone present in the brain, accounting for their more elaborate songs.

And just to show that these hormones plan major parking Birdsong experiments have revealed that when this hormone is inserted under the skin as baby female songbirds to develop more elaborate songs.

The professor describes two physiological reasons to explain why male songbirds have more elaborate songs than female songbirds. Describe these differences.