It is hard to see them, but you can feel them. They're called no-see-ums and leave people itching for relief.
"It's kind of like a little gnat or a little tiny mosquito. They just annoy you, basically," said Rich Knecht.
Knecht bird-watches daily, but he runs into an unwelcome traveler.
"The closer to the water you got, the more you're going to see them and feel them," said Knecht. "They itch like crazy. I forgot to cover up a couple times on the lawn, and I would come back in and just down my shins and all my forearms just bitten."
While they are tiny insects, their bites can be horrendous.
"Hence the long sleeves and long pants, even though it's in the mid-80s," said Knecht.
People like Knecht cover up in long sleeves to protect themselves from these pesky insects, while others simply use bug repellent.
"We don't treat for no-see-ums. We are specific to mosquitoes. There are lots of different reasons why, but the main reason is there's just not an effective way that anybody has found to treat because of the sheer number they actually live -- that their larval stage is in the soil," said Jenifer McBride with Lee County Mosquito Control District.
There are many misconceptions about no-see-ums. That's why the Lee County Mosquito Control District is hosting a workshop at 5:30 Wednesday at the Sanibel Recreation Center.
McBride said using bug repellent and fans is your best defense.