Body length (mantle)5 hundredths m
9.3 tenthsCredit card widths
5.9 thousandthsLimousine lengths
3.6 tenthsSunglasses widths
Mantle about 5 cm; total span about 20 cm
Photo from Wikimedia Commons
Blue-Ringed Octopus
A golf-ball-sized octopus with enough venom to kill 26 adults/Marine Life
The blue-ringed octopus (Hapalochlaena) is one of the most venomous marine animals in the world, carrying tetrodotoxin — a neurotoxin 1,200 times more potent than cyanide. Despite being small enough to fit in the palm of your hand, a single bite contains enough venom to kill 26 adult humans within minutes. Its iridescent blue rings flash as a warning display. There is no known antivenom.
Measurements
Total arm span2 tenths m
1.2 tenthsYoga mat lengths
1.6 tenthsShipping pallets
9.09Almond lengths
About 20 cm across with arms extended
Weight8 hundredths kg
13.3 trillionthsGreat Pyramids of Giza
80Paperclips
10 millionthsYachts
About 80 grams; lighter than a deck of cards
Jet propulsion speed4 tenths m/s
408 millionthsSR-71 Blackbirds
8.6 thousandthsMLB fastballs
Quick bursts when threatened
Ring diameter3 thousandths m
5.5 hundredthsPink erasers
2.5 tenthsSkittles
Distinctive blue rings about 3 mm across
Lifespan63.1 million s
19,985Microcenturies
73.6 millionHeartbeats
About 2 years; live fast, die young