Keeping Wasps away from your hummingbirds / sunbirds feeder

Wasps and bees could become constant visitors and real pests if they could access the sugar solution.

With many other feeders the "flower" is relatively close to the sugar solution, inviting such pests.

The feeder offered here has a relatively low solution level and will not allow access to such pests.

However, you can avoid wasps and bees by doing one of the followings:

Cut the bottle head higher

The sugar solution level will be determined by the level of the bottle opening.

 Since the bottle is upside down – the higher you cut the bottle head, the lower the solution level you'll get (denying the wasps and bees)

Cut the bottle head just a little higher (the red line instead of the yellow)

Hummingbirds and sunbirds has a long beak and can reach deep to low sugar solution.
They even use their tongue to collect the solution, therefore going even deeper

add a layer of glue  

If the solution level is too high to prevent access for wasps and bees and you don't want to cut a new bottle and replace it, you can fix it by adding a layer of glue (using the glue gun):

Apply a thick layer of glue on the top of the bottle edge all around the edge.

Interesting: notice the snake-like tongue edge.