Diameter3.5 tenths m
39.6 millionthsMount Everest heights
8.3 millionthsMarathon distances
Photo from Wikimedia Commons
Crown-of-Thorns Starfish
A venomous coral-eating starfish with up to 21 arms/Marine Life
The crown-of-thorns starfish (Acanthaster planci) is a large, venomous starfish that feeds on coral polyps and is one of the greatest threats to coral reefs worldwide. Adults reach 25 to 35 cm in diameter, with 12 to 21 arms covered in sharp, venomous spines up to 5 cm long. A single starfish can consume up to 10 square meters of coral per year. Population outbreaks, possibly linked to nutrient runoff from agriculture, have devastated large sections of the Great Barrier Reef.
Measurements
Body mass1.5 kg
7.4 millionthsStatues of Liberty
8.3 thousandthsMale gorillas
1.1Costco rotisserie chickens
Spine length5 hundredths m
9.6 hundredthsHuman forearms
9.1 thousandthsKing cobras
Arms21 arms
1.75Dozens
565 quadrillionthsCells in a human body
1.5 hundredthsMinutes in a day
Maximum; typically 12 to 19
Coral consumed per year10 m^2
500Subway tiles
5.1 hundredthsAmerican houses