Oh, how meta is this. Ricky Gervais is on TV, doing his Animals stand-up thing, complaining about people filling websites with useless facts... including:
The peanut is not a nut but a legume.
You can lead a cow upstairs but not down.
When a crab's pissed it walks forwards instead of sideways.
The daddy longlegs as the strongest poison known to man, but it can't administer it as it has no teeth.
One of those may not be true.