Why is it called a "crane" when it's so obviously an elephant?

[khiemtran]

There are bridgeworks near our house, so I took Liem for a walk to see the giant crane that had been maneuvred into position ready to lift the pre-formed bridge sections into place. Liem was very impressed and pointed at the giant red arm on top of the vehicle.

"Truck!" I thought he said.
"Truck! Big, red truck," I agreed.
"Trunk!" he corrected me, and made the sound of an elephant trumpeting.
"Oh yes, trunk..."