What is the difference between malagueta pepper and bird's eye chilli?

Malagueta pepper vs Bird's eye chilli

The short answer

The same species, Capsicum frutescens, and close relatives of the African bird’s eye behind piri-piri — which is why malagueta and bird’s eye can stand in for each other at the same quantity. Malagueta is the Brazilian pepper of Bahia, small, thin-skinned and usually preserved whole in oil or vinegar; the Thai chillies sold as bird’s eye are mostly Capsicum annuum. For Bahian food, a frutescens bird’s eye is the closer substitute than a Thai one.

Side by side

Malagueta pepper and Bird's eye chilli compared side by side
	Malagueta pepper	Bird's eye chilli
Botanical identity	Capsicum frutescens L.	Capsicum frutescens L., Capsicum annuum L.
Part used	fruit	fruit
Origin	Capsicum frutescens originated in lowland tropical South America. Malagueta is its Brazilian form, grown especially in Bahia and the northeast.	The Americas, like every Capsicum, and specifically naturalised and developed in Southeast Asia and East Africa after the Columbian exchange. The peppers now called bird's eye are the product of four centuries of local selection rather than of American cultivation.
Flavour notes	hot, sharp, green, clean	sharp, grassy, very hot, clean
Heat	Hot, with a fast, clean onset.	50000–100000 SHU (typically 75000 SHU)
Flavour	Clean, sharp, quick heat with a fresh vegetal note. In oil or vinegar the liquid takes the heat and the fruit softens.	Clean, direct heat arriving almost immediately, with a thin grassy note behind it. Red fruits are slightly sweeter and rounder than green. The heat is sharp rather than broad and it does not linger the way a superhot does.
Aroma	Sharp and green, with little of the fruitiness of Capsicum chinense.	Sharp and lightly grassy, much less pronounced than the heat and much less fruity than a habanero. There is not a great deal of aroma here — this is a chilli bought for pungency.

Can you swap them?

Substitution is directional: the answer is often different in each direction, and both are recorded.

Bird's eye chilli

Good match

Use: 1× by volume — Chilli for chilli, fresh or steeped in oil or vinegar.

A small, hot, thin-skinned chilli of the same or a neighbouring species, and it behaves the same way in oil, vinegar or a fresh sauce.

How the replacement compares on each sensory axis
Flavour	Aroma	Colour	Heat
close	close	close	similar

Works for

Molho de pimenta
Chillies in oil or vinegar
Moqueca

Does not work for

A Brazilian cook who knows the difference in a side-by-side tasting

Established culinary practice

Which should you buy?

Malagueta pepper

Fresh or bottled. Outside Brazil the bottled chillies are the realistic form; a bird’s eye chilli steeped in vinegar is a close relative if nothing else is found.

Bird's eye chilli

There is no ground form in ordinary use, and the meaningful choice is fresh against dried. Buy fresh for Southeast Asian cooking, where the grassy sharpness and the raw use are the point, and freeze what you will not use within a fortnight — this chilli freezes better than any other fresh pepper in the catalogue and can be sliced straight from the freezer. Dried pods are for frying whole into a hot oil at the start of a dish, which is a different technique and a different flavour, and they are not a preserved version of the fresh pod.

Full detail on malagueta pepper and bird's eye chilli, including evidence grades and sources for every claim above.