Your day's wildlife

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Dave 123

Legendary Member
A few more from lunchtime


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biggs682

Touch it up and ride it
Location
Northamptonshire
Just caught this fella having his tea

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deptfordmarmoset

Full time tea drinker
Location
Armonmy Way
Here's a question that occurred to me when I saw a pair of goldfinches fly past my kitchen window this morning. Why do smaller birds tend to use their wings in short bursts alternating with glides? Just about all the birds bigger than a kingfisher seem to do a steadier, more constant flight. It obviously suits finches but I don't know why. Does anyone?
 

midlife

Guru
I think it's something to do with energy conservation?
 

deptfordmarmoset

Full time tea drinker
Location
Armonmy Way
I think it's something to do with energy conservation?
Wikipedia says:

Small birds often fly long distances using a technique in which short bursts of flapping are alternated with intervals in which the wings are folded against the body. This is a flight pattern known as "bounding" or "flap-bounding" flight.[11] When the bird's wings are folded, its trajectory is primarily ballistic, with a small amount of body lift.[2] The flight pattern is believed to decrease the energy required by reducing the aerodynamic drag during the ballistic part of the trajectory,[12] and to increase the efficiency of muscle use.[13][14]
So, it seems that they're built more for powered aero-tuck gliding than for simple flight.
 
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