Strange morning melody

I live near a zoo so I think the sound is probably coming from there. I don't hear it anymore unfortunately and the zoo didn't answer my message when I asked them. It could be heard very early in the morning. It's a very strange long melody:

It has two parts. First there's a long continuous note, which starts at a high pitch then it becomes louder and suddenly drops down. Then in the second half there are separate parts. The first part starts at about the same pitch where the first half of the melody ended, then each part starts at a higher and higher pitch until it reaches a pitch which is about as high as when the melody started. These small parts start with a higher pitch just for a moment then it drops down to a slightly lower pitch and ascends slowly.

The whole melody lasts for about 5 seconds then there's a pause for some seconds and the melody starts again. Sorry, it's hard to explain. I've never heard anything like it. It's such an amazing sound.
I hope this works, I try to draw the melody:

------- _ /
\ _/
\ _ /
\ _/
\ _ /
\_ _/

Comments for Strange morning melody

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Apr 14, 2014
strange morning melody
by: Brook

I don't have a clue but it is difficult to decipher your description and graph. It seems like it would be a bird.

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