Fulvous whistling duck gender determination by listening to their call

Vocal fulvous whistling ducks, Dendrocygna bicolor
The female (in front) makes a differt call then the male (back).
Females make a slightly lower and hoarsely call.
Males make a slightly higher and sharper call.
More reference: moscowzoo.su/p...
Source: moscowzoo.su/p...

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Which is male and which one is female

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