Penguin Watch Talk

Subject: APZ0007nrx

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  • coldcounter by coldcounter

    Difficult to distinguish between 3/4 grown chicks and parents 😃 I am sure that I was not 100% accurate but hopefully it will help the

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  • coldcounter by coldcounter

    scientists. In fact, I am not altogether sure that this is not a mixed colony as I have been confused with the height and size of the adult

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  • coldcounter by coldcounter

    birds before .... anyone got any thoughts on that ?

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  • gardenmaeve by gardenmaeve moderator

    I see only #gentoos here. You are of course correct that it's tricky to tell adults from nearly mature chicks at this distance.

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  • gardenmaeve by gardenmaeve moderator

    I can easily enlarge it and clearly see chicks VS adults now, but that isn't possible when we're classifying.

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  • gardenmaeve by gardenmaeve moderator

    So, what to do? The FAQs have the answer: When in doubt, mark as adult.

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  • gardenmaeve by gardenmaeve moderator

    When you can clearly see a bird lacks the major signs of maturity... such as the adult gentoo full head flash and black throat,

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  • gardenmaeve by gardenmaeve moderator

    or it doesn't have the dark black chin of adult adelies, mark it as a chick. I

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  • gardenmaeve by gardenmaeve moderator

    I often re-read the FAQs because there is so much helpful, easy information there. Here's a helpful section for this question: http://talk.penguinwatch.org/#/boards/BPZ0000007/discussions/DPZ0000ac2

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  • coldcounter by coldcounter

    I think that is what I have done with most of the marking @gardenmaeve 😃 they just got a bit blurry and if they looked closer to adult

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  • coldcounter by coldcounter

    size and I couldn't see the head I marked them as adults. My other comment re mix is a general observations from here... There have been

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  • coldcounter by coldcounter

    times when time wise - say November - you should only see adults but the image will have a few stray birds that are only half the height of

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  • coldcounter by coldcounter

    the majority. They shouldn't be chicks and I don't think it is a distance perspective thing so I can only think they are "visitors" ? 😃

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  • gardenmaeve by gardenmaeve moderator

    Adult gentoos: 51 to 90 cm (20 to 35 in), with the males being considerably taller than females. I wonder if you are seeing that size range?

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  • gardenmaeve by gardenmaeve moderator

    We know there can be various penguin species within a general rookery area...

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  • gardenmaeve by gardenmaeve moderator

    but if we can see only gentoo marks, we know we are seeing gentoo birds only- make sense?

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  • gardenmaeve by gardenmaeve moderator

    For our purpose here it really doesn't matter. The scientists know exactly what species are at each location. We mark only adults and chicks. 😉

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  • coldcounter by coldcounter

    I didn't realise there was a height difference between the sexes and on reflection I reckon that may well be what I have noticed. Thanks 😃

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  • gardenmaeve by gardenmaeve moderator

    Yep- it's about the only visual way to tell male from female, but not reliable for gender ID. Glad to help! Thanks for your faithful work!

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  • AvastMH by AvastMH moderator

    Interesting - in small garden birds the female can be the larger because of the requirement to produce eggs. 😃

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  • gardenmaeve by gardenmaeve moderator

    In species like the Bald and Golden eagles, hawks, and owls the females tend to be larger. The same is true for hummingbirds.

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  • yshish by yshish moderator, translator

    At penguins, sometimes chicks can appear even bigger than adults .) And yes, the male/female size differences are not significant in these pictures.

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