Which is bigger, mallard or peregrine falcon?

Mallard is somewhat greater than peregrine falcon on weight — about 1.2×. Both figures are typical values; the full range for each is in the table above.

How do mallards and peregrine falcons compare on length?

Mallard: 0.5–0.65 m. Peregrine falcon: 0.34–0.58 m. Mallard is somewhat greater than peregrine falcon on length — about 1.3×.

How do mallards and peregrine falcons compare on width?

Mallard: 0.81–0.98 m. Peregrine falcon: 0.74–1.2 m. Peregrine falcon is somewhat greater than mallard on width — about 1.2×.

Mallard vs Peregrine falcon

Mallard vs peregrine falcon

Mallard is larger on weight

Mallard is somewhat greater than peregrine falcon on weight — about 1.2×.

A mallard and a peregrine falcon can be compared on 5 measures. The figures below are typical adult or full-size values, with the larger of the two in bold.

Side by side

Larger value in bold. Ranges reflect genuine variation, not uncertainty.
	Mallard	Peregrine falcon
Weight	0.7–1.6 kg	0.33–1.5 kg
Length	0.5–0.65 m	0.34–0.58 m
Width	0.81–0.98 m	0.74–1.2 m
Top speed	88 km/h	90–390 km/h
Typical lifespan	3–29 yr	8–19 yr

What the numbers say

Mallard is somewhat greater than peregrine falcon on weight — about 1.2×.
Mallard is somewhat greater than peregrine falcon on length — about 1.3×.
Peregrine falcon is somewhat greater than mallard on width — about 1.2×.
Peregrine falcon is 3.6× mallard on top speed.
Peregrine falcon is 2.6× mallard on typical lifespan.

Weight compared.

Mallard 0.7–1.6 kg

Peregrine falcon 0.33–1.5 kg

Mallard

The most common wild duck in the Northern Hemisphere and the ancestor of nearly all domestic ducks.

Peregrine falcon

The fastest animal on Earth, reaching over 320 km/h in a hunting stoop.

This is a comparison of published measurements, nothing more. It describes how two things differ on measures that have been recorded; it does not predict how they would fare against each other in any situation.

Common questions

Which is bigger, mallard or peregrine falcon?: Mallard is somewhat greater than peregrine falcon on weight — about 1.2×. Both figures are typical values; the full range for each is in the table above.
How do mallards and peregrine falcons compare on length?: Mallard: 0.5–0.65 m. Peregrine falcon: 0.34–0.58 m. Mallard is somewhat greater than peregrine falcon on length — about 1.3×.
How do mallards and peregrine falcons compare on width?: Mallard: 0.81–0.98 m. Peregrine falcon: 0.74–1.2 m. Peregrine falcon is somewhat greater than mallard on width — about 1.2×.

Sources

Wikidata — Wikimedia Foundation (CC0 1.0)
Smithsonian National Museum of Natural History — Smithsonian Institution

How these figures are compiled and checked