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The Sinharaja Bird Wave – The Longest Studied Bird Wave

This valuable information is gathered by Training program on The Sinharaja Bird Wave – The Longest Studied Bird Wave conduct by SLAITO. Speaker was Prof.Sarath Kotagam,

•Sinharaja Rain forest has one of the largest Birds flocks in the world that can be seen and is a world heritage site.
•The largest mixed species of bird feeding flocks can be found. (Bird wave, Bird Feeding flocks) Two or more species feeding and moving in a direction.
•In the morning there’s is silence in the forest and occasionally there is a sound of birds in a distance and towards midday you can hear the sounds of these birds mainly shown below

* Hornbill
* Barbet
* Jungle fowl







Why do flocks Form

  • To increase foraging efficiency
    • Limited time available for foraging in rain forest.
    • To reduce predation pressure.
    • According to observations the numbers of flocks in an average are 12 species.
    • Number of individuals 41.

The above compositions are generally stable

  • Very few migrant birds join the flock
  • One or two species dominates the flock
  • In the past the number of species have increased by 07Red Faced Malkoha is a very imported member of the flock.










Endangered Species

Orange Billed Babbler






* Crested Drongo






The below birds are decreasing in numbers

Bar Winged Flycatcher – shrike






Yellow-fronted Barbet






Sri Lanka White-Eye






Ashy Headed Laughing Thrush is increasing in numbers







Roles Played by flock Members

  • Kleptoparasitism
  • Alarm calls
  • Flock forming
  • Flock Maintenance
  • Wake up call
  • Indicator call
  • Mobbing call


Distribution of birds within the forest canopy










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