September 24 is International Save The Koala Day, and we thought we'd share this article by Take Part that gives a glimpse into the lives of koalas and some of nature's other incredible creatures.

You can join in today's Save the Koala Day by captioning this marsupial's photo now. Use our builder by clicking the image and adding your best caption by 12pm PT Friday, 9/26. The top entries will be published on Saturday morning for you to vote and decide which were the best!

If you don't have a caption to enter, you can still click here to read and vote on all the captioned submissions.

We all know sea otters are awesome, but did you know they're helping to fight climate change? The good people at Take Part have the scoop!

In celebration of these hand holding eco-heroes, we want you to caption this photo! Click and use our builder to add your best caption before 12pm PT Friday, 9/26. The top entries will be published by Saturday morning for you to vote and decide whose was the best!

Even if you don't enter your own submission, click here to see all the captioned submissions.

By the way, if you're more of a fan of captioning marsupials, stay tuned for another contest this Wednesday (9/24).

Update: This contest is closed to new captions, but click the image above and vote on who's caption was the best now! Results will be digitally crowned Tuesday 9/9 morning!

These pugs are totally ready to be captioned! Click and use our builder to add your best caption before 12pm PT Friday, 9/5. The top 25 entries will be published by Saturday morning for you to vote and decide whose was the best!

Even if you don't enter your own submission, click here to see all the captioned submissions and vote on your favorite to make it into Friday's final fight for glory!

Do you think you have the perfect caption for this image? Let's hear it! Add text to the picture here. Once that's done, you can submit your LOL here.

Our new commenting system also allows you to insert your captioned image directly into the comments! Give it a try!

A new week, a new picture of Winston for you to caption! Help make Winston a star by adding a funny caption! You could win our 2013 page-a-day calendar and a copy of The Oatmeal's "How to Tell if Your Cat is Plotting to Kill You."

For more information about the contest, visit the Cheezburger Blog!