Large flock of birds seems to fly into ground, many dead and injured

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Discussion Overview

The discussion revolves around the phenomenon of a large flock of birds crashing into the ground, resulting in many dead and injured birds. Participants explore various potential explanations for this behavior, including biological instincts, environmental factors, and physical dynamics. The scope includes observational analysis and speculative reasoning about animal behavior and environmental interactions.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that the birds may have been responding to a predator, leading to a coordinated avoidance response similar to moths reacting to bat sonar.
  • Others propose that the density of the flock could have affected lift, causing lower birds to lose altitude significantly, akin to helicopters in close proximity.
  • One participant raises the possibility of a toxic cloud affecting the birds, though they note that this would likely leave more birds on the ground for a longer period.
  • Another explanation mentioned is the occurrence of a downdraft or microburst, although some express skepticism about the localized nature of such air movements.
  • There is a suggestion that the flock may have miscalculated their flight path, leading to collisions similar to stubbing a toe or stumbling.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the cause of the incident, with multiple competing views and hypotheses remaining throughout the discussion.

Contextual Notes

Some explanations depend on assumptions about bird behavior and environmental conditions, and the discussion includes unresolved questions about the specific dynamics at play during the incident.

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So are there any ideas what happened? Flocks of birds and schools of fish often behave like this, but you would think that birds would have a clue where the ground was...
 
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berkeman said:
schools of fish
I've only heard of this with whales/dolphins.

It was a very dense flock of birds.
The article had 2 possible explanations:
toxic cloud or something like that
or scared (as a flock, which moves together due to their flock coordinating instincts) by a predator into a predator avoidance response.
The second option would be somewhat like moths diving toward the ground when they hear bat sonar. When a moving car emits bat-like frequencies, some moths will dive into the front of a car due to an unfortunately triggered reflex.
 
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I wonder if their density becomes too great and they happen to be descending that the lift of the lower ones significantly drops? Like if a helicopter flew directly over another helicopter wouldn't the lower one loose lift?

Flock videos no crashing,



 
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There are some fun bird flock effects in some shows.
I think during one of the Rome shows (HBO I think) a flock above the horizon formed a skull.
Kind of like The Mummy doing shapes in sand.
 
berkeman said:
So are there any ideas what happened? Flocks of birds and schools of fish often behave like this, but you would think that birds would have a clue where the ground was...
I think it just looks as if they lost their way on follow the leader ( there isn't one ) en mass, and some of them hit hard and stunned. A miscalculation like when you stub your tow, or stumble on a crack on the sidewalk.
I wouldn't expect all flocking to be completely perfect all the time.
Toxic gas would have left a lot more on the ground for a lot longer.
A predator from above would have seen them all disperse radially in an expansion and regroup after rather than driving them downwards.
 
Another possibility I've heard raised is a downdraft/microburst. There is definitely air movement ahead of the birds hitting (puff of dust in the street, bush in the left foreground), but I can't be sure if the mass of air is moving them or if they are moving it. I also didn't think downdrafts could be quite this localized, so I'm leaning against this explanation. Just putting it out there.
 
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