Can anyone explain Tags on Wikipedia?

I found a great picture I'd like to use for an article and it's dated 1871 but it says something about using a tag. I find Wiki explanations very confusing. I've spent over an hour trying to figure out exactly what it means.

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This work is in the public domain in the European Union and non-EU countries with a copyright term of life of the author plus 70 years or less.

 You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated Russians (more information).

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Am I supposed to add the crossed out copyright symbol? 

This is what it says about the image.

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{{Information |Description=Tamandua tetradactyla |Source=Proceedings of the Zoological Society of London 1871

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I'm getting a little gun shy.

It is a public domain image. I believe the additional instructions are meant for the original uploader of this image.

Further down it clearly states: This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

It should be perfectly fine for you to use this image.

Most images have buttons which provide all the correct linking codes. They are to the right of the picture.

You've probably already seen this http://copyright.cornell.edu/resources/publicdomain.cfm but as far as I understand, this what you need to adhere to when it comes to using non-US images, in the US. Although, I'm not clued up on this, so hopefully someone else will come along with more info. :)

Someone else did come along while I was typing. 

Thanks.Hollie and nightowl. That simplifies it.

I'm doing my best to stay out of trouble!

Another question, on these, how do you know what the manner specified by the author is?

attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).

As far as I understand, it means you must use the name given by the author under attribution. For example, if I were to allow you to use one of my pictures, I might say attribute the works to HL Thomas. But I'm sure someone else will know more about this. :)

And also, only to attribute the author, not to say that promote or endorse your work in any way.

So just attribute it? I can do that.

That's my understanding, Lana. When you download an image it will say attribution and give name etc. I copy and paste it, exactly as shown.

OK thanks. I have had to hunt for the name on occasion but I usually can find it.

If it is public domain and has a crossed out copyright symbol, that means you can freely use it without attribution on anything you want.  If there is other information along with the material, then perhaps something contradictory is going on. Without the full link to the page you're looking at, I can't tell what is really happening.

You might want to check out my article that lists all the kinds of copyright, creative commons and other categories of images:

http://wizzley.com/download-use-images-for-free-avoid-copyright-infringement/

Hope this helps. I understand you being gun-shy. It is scary to think we might be doing something illegal.