Here are six fascinating animals where only the males give birth.

But, the captivating pipefish dares to break these established rules. They are called pipefish because they look like, well, pipes – long and skinny. These marine creatures are basically slimmer ...

In pipefish, a remarkable species of fish, it's the males who get "pregnant." A recent study reveals how these fish defy evolutionary norms and adapt their biology to reversed reproductive roles.

Male and female dusky pipefish look exactly the same in all but one aspect—males have a pouch for incubating eggs when they ...