THE ANIMAL FILES

Goliath birdeater

Theraphosa blondi

“Birdeater” describes a possibility, not the everyday menu.

Goliath birdeaters are terrestrial rainforest spiders of northern South America. Large arthropods and other small animals make up much of their food; birds are rarely taken. Burrows, sound-producing hairs and defensive hair release add detail beyond sheer size.[1]

Follow the evidence ↓
Goliath birdeater
Image: Didier Descouens · Commons · CC BY-SA 4.0
Home
Deep terrestrial burrows[1]
Typical foods
Large arthropods and other small animals[1]
Signal
Stridulation by rubbing specialised hairs[1]

A name larger than the bird diet

Wild diets include arthropods, worms and amphibians, with occasional other small vertebrates. Birds are not the routine defining food implied by the name. Prey can be dragged to the burrow, where tissues are liquefied before ingestion. Feeding is therefore not the chewing of solid chunks in the mammalian manner.[1]

Several defensive responses

Rubbing hairs on the palps and legs produces sound. Other movements release hairs from the abdomen when threatened. These are distinct mechanisms: making a sound does not require a bite, and release of defensive hairs is not the same action as injecting venom through fangs.[1]

A hidden rainforest stage

The spider is mainly nocturnal and uses deep burrows in moist rainforest settings. Females produce eggs that develop into spiderlings, while adults differ in longevity and reproductive roles. The conspicuous legs do not make the resident easy to observe when most activity is at night and much time is spent within shelter.[1]

A COMMON MIX-UP

Does its name prove birds are its usual prey?

No. Birds are rare prey compared with the broader small-animal diet.[1]

TRY A LITTLE REASONING

Why separate sound production from biting when describing defence?

Reveal the explanation

They use different structures and actions, so hearing a sound does not itself demonstrate a bite.[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 — Theraphosa blondi (adapted and translated; exact revision)
  2. NCBI Taxonomy — Theraphosa blondi (identity and game lineage)

Last fact check:

One discovery leads to another

Brown recluse spiderA violin mark is a clue, not a verdict.Loxosceles reclusa ↗Southern black widowA tangled web is organised around catching and wrapping.Latrodectus mactans ↗Mediterranean black widowThirteen spots are a clue, not a complete identification.Latrodectus tredecimguttatus ↗