Have you ever wondered why the birds that fill the air
around us today use their beautiful singing voices? Courtship songs are one of
the most common uses for these creatures amazing singing abilities. Different
bird species use this singing ability in different ways and some even add other
hidden surprises to the mix to complete their courtship ritual. I could write
pages upon pages on the mountain of different bird species and their courtship
techniques but to save a bit of time I will simply be looking at a few
examples. The satin bowerbird, zebra finch and long-tailed manakin show unique
approaches to courtship in the avian world.
A male satin bowerbird courts with a female at specialized
structures called bowers (Lofredo, 1985). The courtship includes a complex
pattern of vocalisations which is followed by a broad-band; mechanical-sounding
song is followed by mimicry (Lofredo, 1985). Studies show that the older male birds
produce a longer and higher quality vocalisation which leads to females
choosing the older males more often over the younger males (Lofredo, 1985).
The zebra finches courtship song is joined by a type of
dance as well. This display includes a song which they have learned, as well as
movements of their body, head and beak (williams, 2001). Each bird has a different sequence of
beak movements but it is said that there is resemblance between the father and
sons movements (williams, 2001). It is thought that a father teaches
his son his courtship song and dance then the son makes slight changes to it to
make the routine recognised as their own (williams, 2001).
Finally the long-tailed manakin, these birds complete their
courtship routine in pairs (trainer, 1995). This partnership consists of the
dominating alpha male and his beta male (trainer, 1995). The pair complete this performance
together in unison in order to attach females to the area (trainer, 1995). This way of courtship ritual allows
the female to see how well the male partners with another male, looking for a
cooperative long-term partner (trainer, 1995).
The courtship song and dance is only one aspect of the birds
life which they use their singing and dancing capabilities. Next week we will
explore more into the avian world.
Works Cited
Lofredo, C., 1985.
Male courtship vocalisations as cues for mate choice in the satin bowerbird. AUK,
Volume 103, pp. 189- 195.
trainer, J., 1995. Singing preformance, frequence matching
and courtship sucess of long--tailed manakins. Behaviour ecology scoial
biology , Volume 37, pp. 249-254.
williams, H., 2001. Choreography of song, dance and beak
movements in the zebra finch. The journal of Experimental biology, Volume
204, pp. 3497 - 3506.
Very interesting descriptions! As older male bowerbirds produce higher quality vocalizations, do you think that this is a signal of the males genes (good genes hypothesis) or do you think it was just an arbitrary trait that females found attractive (sexy sons hypothesis)? You mention that zebra finch fathers may “teach” their sons. Is there actually any real evidence that fathers are teaching, or is it merely that sons are learning through observing their fathers? Nice post.
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