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Last Updated: Thursday January 13 2011 19:17 GMT

Could tagging penguins hurt them?

Penguin with flipper tag

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Penguins have had their flippers tagged by scientists for years so they can find out more about them - but could this be harming the birds?

Tagging is the main way for experts to keep a close eye on the birds and learn more about their behaviour, which can be used to give us an insight into climate change.

But new research's shown that tagged penguins die younger and have fewer babies.

Not only that, the tags might actually change the way they behave too, which is a big deal - as Sonali's been finding out...