Tree Swallows mating


Mating among birds, while essential for survival, goes by amazingly quickly. For these Tree Swallows, from the arrival picture to the departure picture, only a second transpired. But the mating was accomplished.

A male flies to a female, who is already lifting her tail to provide access to her cloaca. 

He arrives on her and adjusts his tail so their cloaca make contact and sperm is passed.

Then a second after arriving, he lifts off. But he will stay with her to help raise their chicks.


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3 Responses to Tree Swallows mating

  1. Allan Hobden says:

    NASA….dramatically advises same…we have lift-off!

  2. Unbelievable skill and artistry in capturing this rapturous moment. Thank you Alisdair!

  3. Stephen Wells says:

    Wow! Great series of shots. Thanks!

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