Yes, if they want they can easily get over 4 ft., but large breed heavy adults will probably not want to. They can slide through surprising small spaces, but I have found they are more likely to flatten out and slide under. Younger birds are more likely to go over. My chickens are all getting older 3-5 yo. At this point they don't even leave the yard if I leave the gate open.
Here's a pix of my 4 ft gate. They do get up on the garbage can, but don't go over. (Yet)
When they hear me drive into the gravel driveway they gather at the gate to start screaming for scratch.
Imp- do they have me trained or what?
Here's a pix of my 4 ft gate. They do get up on the garbage can, but don't go over. (Yet)

When they hear me drive into the gravel driveway they gather at the gate to start screaming for scratch.
Imp- do they have me trained or what?
