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Bee or Fly? Here’s How to Tell

If you’ve ever looked closely at the flowers in your garden, watching the many insects coming and going, you’ve probably seen a lot of different insects, some that you recognize, and some that you don’t.

Did you know that in the world there are 20,000 different spices of bees? This is astonishing, right? And surely would surprise many people who picture honey bees when they think of bees. Did you know honey bees are not native to North America? In North America there are 4000 native species of bees! That’s a lot of bees! So when you see a bee at one of your flowers and you start paying attention, you’ll notice subtle differences in them. Even bumblebees, which most people can recognize, are varied. Did you know that North America is home to 46 different kinds of bumblebees! 

It is definitely hard to tell some of them apart, especially without a good field guide. One that I bought recently and am enjoying is called The Bees in Your Backyard, by Joseph S. Wilson and Oliva Messinger Carril. If you ever wanted to be able to identify the bees you see in your garden, this is a great place to start.

Did you know some flies mimic bees, and that some insects also mimic wasps? They do this of course for the protection it affords them. After all, some animals are less likely to mess with a bee or a wasp. 

Here are some ways to tell if that insect you’re seeing is a BEE or a FLY. (from The Bees in Your Backyard, by Joseph S. Wilson and Oliva Messinger Carril)

A perplexing bumble bee (Bombus perplex)

Bees have: 

  • long, slender antennae
  • four wings (though when you see a bee, it’s hard to distinguish that there are indeed four)
  • pollen-collecting hairs on their legs and bellies
  • eyes that are on the side of their heads
  • distinctly separated thorax and abdomen
A furrow bee. Notice the hairy legs and pollen sticking to them, along with the eyes on the side of the head.

Flies have:

  • short antennae
  • two wings
  • no pollen-collecting hairs
  • large eyes, often forward facing, sometimes touching, on the top of their heads
  • a thick waist where the thorax meets the abdomen
A fly. Notice the short antennae.

Here are some photos. See if you can tell if it’s a fly or a bee.

A sharptail bee
This is a bee. Notice the long antennae and the eyes on the side of the head.
A fly. Notice the large eyes, short antennae and no waist.
Amazingly, this is a bee. Look closely at the eyes, the antennae, and the waist.
A fly on black eyed Susan.
A bee.
This is a pure green-sweat bee on mint.
A bee
A cuckoo bee
This is a specialist bee, on yellow Passion flower.
A fly on a leaf. Notice the short antennae.
This one is a tricky one because it does have long, slender antennae. But it is a fly. Notice the two wings and very big eyes and also no hairy body or legs to collect pollen.
Both of these insects on the mint are bees.
This is a carpenter-mimic leafcutter bee
A honeybee with full pollen baskets
A bee–see all of the pollen on its body and legs?
A carpenter bee. Remember this to help you determine between a bumble bee or a carpenter bee. Shiny hiney=carpenter bee. Bumblebees on the other hand have furry butts. 
This is a flat-tailed leaf-cutter bee on mint.
This is a bee on milkweed. Here you can see its four wings.
A fly on a leaf.
This fly’s eyes take up its whole head. And notice again the very short antennae.
A fly–notice the super short antenna.

Next time you’re in your garden, pay more attention to the insects that gather there. See if you can notice differences. If you watch them enough you’ll begin to notice many different kinds visiting your flowers. It’s fun to look and see how many you have.

2 thoughts on “Bee or Fly? Here’s How to Tell

  1. Oh, this was a fantastic article, Sharon! I have been trying to get to know my pollinators these past two summers. We have a bee hotel (we call it Buginham Palace because of its size) that attracts many of the solitary bees and other pollinators, so it’s an excellent place to look carefully at bees vs. flies (and many wasps too!) Thanks for sharing your expertise – I am going to share this with my colleagues. 🙂

    1. Sharon Mammoser says:

      Hi Lisa, yes there are soooo many pollinators to know! The book I suggested in the post is an awesome place to start. I love Buginham Palace!! What a great name. You are so welcome. Thanks for following along.

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