Britannica
Sources used in this answer
How do hormones influence song development in zebra finches?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Instinct
Foraging is an example of an instinct driven by impulses serving specific biological functions.
In zebra finches (Taeniopygia guttata), hormones play a critical role in the development of neural circuitry and the subsequent expression of singing behavior.1
The influence of hormones on song development is demonstrated through the following mechanisms:
- Neural Development: After hatching, male and female zebra finch brains develop differently. If female finches are injected with estrogen early in their development, they acquire the neural circuitry necessary to undergo the learning required to produce song.1
- Stimulation of Singing: While early estrogen exposure allows for the development of the required brain structures, it is not sufficient on its own to make females sing. To exhibit male-like singing behavior, these females must also receive an implant of the male hormone testosterone.1
In essence, the interplay between early hormonal exposure and later hormonal stimulation is necessary to produce females that sing male song, highlighting how hormones act as proximate mechanisms that trigger and facilitate complex social behaviors like birdsong.1