When putting together graphic designs or editing photos, opaque backgrounds on images can be a hindrance - so knowing how to make the background transparent in Photoshop is a useful trick.

And biologists could study exactly how an animal's organs develop ... chicken sliver appeared partially transparent, making it possible for a person to see images displayed behind it.

The adult form, which looks like a small pair of transparent lungs, lacks these tentacles. The sea walnut (Mnemiopsis leidyi) ...

Scientists found a sandy sea creature with “transparent” tentacles off Spain and discovered a new species, a study said. Getty Images/iStockphoto ... the widespread sea animal Parazoanthus ...