Hummingbird
The hummingbird is a tiny bird capable of hovering in mid-air by rapidly flapping its wings to feed on nectar.
How big is it?
8 cm long
Also 3.15 in
Length · defined specimen
A little perspective
Hummingbird vs Sand dollar: length comparison
The length of a hummingbird is approximately equal to the test diameter of a sand dollar.
The hummingbird is a tiny bird capable of hovering in mid-air by rapidly flapping its wings to feed on nectar.
A sand dollar is a flat, burrowing sea urchin with a rigid, disc-shaped skeleton, often found in sandy coastal waters.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Hummingbird
Length: 8 cm; defined specimen.
A chosen 8 cm, 4 g hummingbird; species vary widely.
Defined examples — our methodology
The marked length is calibrated. Unmeasured illustration details are representative.
Sand dollar
Defined test diameter: 8 cm; defined specimen; range 5 cm–10 cm.
A defined living sand dollar with an 8 cm test diameter and 25 g mass. Species and maturity vary; short spines are included visually but do not define the rigid test span.
Smithsonian Ocean — Sea urchins and sand dollars
The marked defined test diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
Why this measurement?
Why we use 8 cm
We compare the length of a hummingbird. This is an illustrative comparison value, not a claim that every example is the same.
A chosen 8 cm, 4 g hummingbird; species vary widely.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 8 cm | Not recorded | defined specimen | |
| 4 g | Not recorded | defined specimen |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueLiving thingsAntarctic krill6 cmDefined adult body lengthAntarctic krill (Euphausia superba) are small, shrimp-like marine crustaceans that serve as a vital food source for many Antarctic animals.
Around the same scaleLiving thingsSand dollar8 cmDefined test diameterA sand dollar is a flat, burrowing sea urchin with a rigid, disc-shaped skeleton, often found in sandy coastal waters.
Nearest higher valueLiving thingsMouse9 cmBody lengthA mouse is a small rodent with a pointed snout and a long, thin tail.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
Living thingsHoneybee1.5 cmA honeybee is a social insect that lives in a colony and gathers nectar and pollen from flowers.
PeopleHuman1.75 mA human is a primate of the species Homo sapiens, distinguished by habitual upright walking, language and complex tool use.
Living thingsAfrican elephant3.3 mAn African elephant is a large plant-eating mammal recognised by its trunk, tusks and broad ears.
Living thingsBlue whale25 mA blue whale is a baleen whale that feeds by filtering small animals from seawater.Living thingsSand dollar8 cmA sand dollar is a flat, burrowing sea urchin with a rigid, disc-shaped skeleton, often found in sandy coastal waters.
SportShuttlecock8.5 cmA shuttlecock is a feathered projectile used in badminton, designed to be struck by rackets.
Everyday thingsPeach7 cmA peach is a juicy fruit with fuzzy skin and a central stone, grown on the tree Prunus persica.
PeopleIndex finger8 cmThe index finger is the second finger of the human hand, located between the thumb and the middle finger.