The swan **Straddles** the gate if its left and right half sit on each side of the gate.

[Definition of *Straddle* - ][1]

1a. To stand or sit with a leg on each side of; bestride: *straddle a horse.*

1b. To be on both sides of; extend over or across: *a car straddling the centerline.*


  [1]: http://www.thefreedictionary.com/straddle