“Storks,” the brainchild of the new Warner Animation Group screenwriting “think tank,” stretches the Looney Tunes ethos for CG in terms of both comedy and animation style.

First-time animation director Nicholas Stoller (“Forgetting Sarah Marshall”), who wrote the script, teamed up with another directorial newbie, former Pixar animator Doug Sweetland (the “Presto” short), and they paid tribute to the Coen brothers’ “Raising Arizona,” a live-action Looney Tune of sorts.

Storks now deliver packages instead of babies for retail giant, Cornerstore.com, run by the greedy Hunter (Kelsey Grammer). That is, until Junior (Andy Stamberg) and human sidekick Tulip (Katie Crown) inadvertently unleash the long-dormant Baby Machine. They’re forced to deliver an adorable girl to her family, while warding off a Wolf Pack that’s also fallen in love with the baby.

But without its own in-house animation team, Warner Bros. turned to Sony Pictures Imageworks (now headquartered in Vancouver...