THE ANIMAL FILES

Dog flea

Ctenocephalides canis

A dog flea has no wings, but it does not need them to reach a host.

The dog flea is a wingless external parasite that feeds on mammal blood. Its flattened body and long hind legs suit movement through hair and jumping. Its common name does not imply that every flea found on a dog belongs to this species.[1]

Follow the evidence ↓
Dog flea
Image: Fedaro · Commons · CC BY-SA 4.0
Wings
Absent[1]
Shape
Laterally compressed[1]
Development
Egg, larva, pupa and adult[1]

Through a forest of hairs

The body is compressed from side to side and carries hairs and spines. This narrow shape assists movement through a mammal’s coat. Long hind legs provide jumping capability, while piercing-and-sucking mouthparts obtain blood.[1]

Four distinct stages

Development proceeds through egg, larva, pupa and adult. Temperature affects how quickly the cycle is completed, so a warm-condition observation cannot supply a fixed deadline for every setting. Females require a blood meal before producing eggs. The adult seen on a host represents one stage, not the entire developmental sequence.[1]

Dog flea or cat flea?

Dog fleas resemble cat fleas, which also occur on dogs. The head is more rounded anteriorly in the dog flea, and microscopic hind-leg features help separate them. A host’s identity is therefore not a sufficient identification key.[1]

A COMMON MIX-UP

Is every flea on a dog necessarily a dog flea?

No. Cat fleas can also use dogs, so the insect itself must be identified.[1]

TRY A LITTLE REASONING

Why is body shape useful even without flight?

Reveal the explanation

It helps the flea pass through host hair, while jumping is supplied by the hind legs.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Ctenocephalides canis (adapted and translated; exact revision)
  2. NCBI Taxonomy — Ctenocephalides canis (identity and game lineage)

Last fact check:

One discovery leads to another

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