A sweet and funny picture book that looks at the blossoming friendship between an elephant and a tank and encourages kids to make friends, not war.      Tilly the elephant is taking her morning stroll when she notices something strange on the horizon. Is it another elephant? The newcomer has a trunk and tail, but he's a very curious shade of green. Tank, on the other hand, notices an odd-looking creature approaching. It has a barrel and a turret, like Tank, but is a curious shade of blue. Is it a new enemy tank? Tank's alarm sounds and he goes BOOM, scaring Tilly off. But when Tilly returns with a flower, Tank begins to understand that she might not be an enemy at all.      Tilly and Tank is a heartwarming tale of friendship, peace and understanding by debut author/illustrator Jay Fleck.