It all starts with the egg.

In spring, chickens start laying again, bringing a welcome source of protein at winter's end. So it's no surprise that cultures around the world celebrate spring by honoring the egg.

Some traditions are simple, like the red eggs that get baked into Greek Easter breads. Others elevate the egg into an elaborate art, like the heavily jewel-encrusted Faberge eggs that were favored by the Russian czars starting in the 19th century.

In the turf war between rabbits and bilbies that plays out in burrows dug into Australia's arid grasslands, rabbits, those aggressive and fertile European immigrants, have largely won out.

But the chocolate bilby has staked its claim on the springtime candy shelf — an honor that could help the threatened species make a real comeback.