What bug is this?
Insects are the largest group you will ever try to identify, and the good news is that a handful of structural questions sort them very fast. Almost all of them can be answered from a single decent photo, and none of them require you to know a name in advance. Count first, then look at shape, then worry about colour, which in insects is often deliberately misleading.
Identify an insect in three checks
1. Count legs, then wings
Six legs means an insect. Eight means a spider or a relative, which puts you in a completely different group and rules out every insect at once. More than eight and you are looking at a centipede, millipede, or a crustacean like a woodlouse. Then count wings: two wings means a fly, and that alone eliminates a great many things people mistake for bees and wasps. Four wings, or wings folded flat as hard covers over the back, sends you toward beetles.
2. Body shape and the waist
Look at how the body sections join. A sharply pinched waist between thorax and abdomen means a wasp or an ant. A thick body with no obvious waist and dense hair means a bee. Hard wing covers meeting in a straight line down the back means a beetle, which is the single largest group of all. Antennae are worth a look too: long and thread-like, short and stubby, or feathered.
3. What it was on, and what it was doing
Host plant is a real clue, not background detail. Many insects feed on one plant family and almost nothing else, so a caterpillar on milkweed is a much shorter list than a caterpillar in general. Note whether it was flying, resting with wings held flat or folded up over the back, chewing a leaf, or sitting on a web. Butterflies usually rest with wings closed upright; most moths rest with wings flat or tented.
Mimics and confusions
Insects mimic each other on purpose, so these pairs are hard by design. Each has one reliable tell.
The Viceroy has a black line running across the hindwing, cutting across the other veins. The Monarch has no such line. The Viceroy is also noticeably smaller, though that only helps if you have seen both.
Bumble bees are large, round, and densely furry all over including the abdomen. Honey bees are slimmer, more amber and brown banded, and their abdomen looks comparatively sleek. Bumble bees are also far louder in flight.
Check the top of the abdomen. Carpenter bees have a shiny, hairless, black abdomen that reflects light; bumble bees are furry all the way down. This is the pair people get wrong most often, usually while worrying about wood damage.
Colour settles it. Bald-faced Hornets are black and ivory white; yellowjackets are black and bright yellow. Their nests differ too: the hornet builds the large grey paper football in a tree, while yellowjackets usually nest in the ground or a wall cavity.
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Get HuckCommon questions
Is it a bee, a wasp, or a fly?
Count wings and look for a waist. Flies have one pair of wings and no pinched waist. Wasps have two pairs and a sharply narrow waist. Bees have two pairs, no pronounced waist, and visible body hair. Several harmless flies mimic bees convincingly, and the wing count is what gives them away.
How do I tell a butterfly from a moth?
Antennae are the reliable feature. Butterflies have thin antennae with a small club at the tip; moths have feathery or plain tapering antennae with no club. Resting posture helps as a secondary clue, with butterflies usually holding wings closed above the back.
What is the best way to photograph an insect for identification?
Get level with it rather than shooting down, so the body profile and the waist are visible, and include the plant it is sitting on. A photo from directly above loses exactly the structure that decides the identification.
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