Marvel has revealed details via a press release regarding the theme that will run through a many of the variant covers offered on April's comics. These special variant covers will all be "WTD Certified," which stands for "WHAT THE DUCK?!" -- which references Marvel's most famous fowl, Howard the Duck.

The 20 variant covers will be available on series both old ("Deadpool," "Guardians of the Galaxy") and new ("Uncanny Inhumans," "All-New Hawkeye") and feature art from a wide variety of artists. Among the announced cover artists are Francesco Francavilla ("Hawkeye," "The Black Beetle"), W. Scott Forbes ("Forgetless"), Christian Ward ("ODY-C") and Rob Guillory ("Chew").

The variant theme follows the announcement of a new ongoing "Howard the Duck" series from writer Chip Zdarsky and artist Joe Quinones. The first issue of that series will come with its own special set of unique variant covers that will chart the birth and evolution of the title character.

You can check out the first four variants and the press release below.

Official Press Release

April is WTD Certified For WHAT THE DUCK?! Variant Covers!

Howard the Duck Waddles Into Your Favorite Marvel Comics for Special April Variants!

New York, NY - February 4th, 2015 - Sure, the highly anticipated HOWARD THE DUCK #1 from Chip Zdarsky and Joe Quinones hits comic shops in March, but Marvel is keeping the celebration going all the way into April! Today, Marvel is proud to unveil WHAT THE DUCK?! Month - a series of 20 special variant covers for April featuring that fabulous fowl, Howard The Duck! Now is your chance to see some of the most popular artists in the industry provide their own spin on that magnificent mallard!

"Response to the announcement of the new Howard the Duck series has been staggering," says Marvel SVP Sales & Marketing David Gabriel. "There were so many talented artists eager to take a quack at drawing a Howard cover we couldn't resist building an entire variant month around him. This April is going to be WTD certified!"

Today, Marvel is excited to reveal the following WTD Variants by some of Marvel's greatest cover artists:

· All-New Hawkeye #2 - WTD Variant Cover by Francesco Francavilla

· Amazing Spider-Man #17 - WTD Variant Cover by W. Scott Forbes

· Rocket Raccoon #10 - WTD Variant Cover by Rob Guillory

· Uncanny Inhumans #0 - WTD Variant Cover by Christian Ward

Look for these additional WTD Variants to grace the covers of these exciting Marvel comics throughout the month of April:

· All-New Captain America #6

· All-New X-Men #41

· Ant-Man #4

· Daredevil #15

· Deadpool #45 (a.k.a. Deadpool #250)

· Guardians of the Galaxy #26

· Hulk #14

· Inhuman #14

· Legendary Star-Lord #11

· Ms. Marvel #14

· S.H.I.E.L.D. #5

· Silk #3

· Spider-Gwen #3

· Superior Iron Man #7

· Thor #7

· Uncanny Avengers #4

No fan can afford to miss out on these exciting variant covers featuring the one and only web-footed wonder! Run, don't walk to your comic shops this April to get your hands on these can't miss WHAT THE DUCK?! Variant Covers!