The caption reads:
A bladder-bird (bottom right) glides over slopes near the floor of an Europan valley. Higher up the slope, another has inflated its air bladder in response to low pressure; after landing it will crawl up, cross the ridge in vacuum, and drop down into the next valley.Exploring Europa – Penguin 2096
This is going to be VERY small on the page, so some problems that are visible on the full-sized image, such as a black outline on the bladder-bird, shouldn't be visible in the final result.
