Wildlife
The Blue Chaffinch: Tenerife's Pine-Forest Endemic
A finch the colour of a cloudy sky at 2,000 m sits on a pine branch beside the TF-21 road. Its bill is noticeably heavy, almost parrot-like, and it is working on a pine cone with the concentration of a jeweller. This is Fringilla teydea — the Tenerife blue chaffinch — and it does not live anywhere else on Earth.
The bird takes its species name from the mountain, and Teide National Park forms the upper edge of its range. But the blue chaffinch is a bird of the pine forest, not the bare summit. It stays below the timberline, in the belt of Pinus canariensis that wraps the mountain between roughly 1,000 and 2,000 m. That forest is its entire world, and the bird’s story — its distribution, its vulnerability, its appeal to a visitor — is the story of the tree it depends on.
Identification
A male blue chaffinch in good light is unmistakable. The plumage is a uniform slate- or steel-blue, darker on the wings and tail, with no bars, patches or streaks to confuse it with any other finch on the island. The female is a different proposition — a dull grey-brown bird that could easily pass for a common chaffinch or a Canary Island chiffchaff to a casual glance. The reliable separator is size and bill structure. The blue chaffinch is noticeably larger and heavier in the body, and its bill is visibly deeper and more robust than the slender beak of Fringilla coelebs, the common chaffinch, which also occurs in the same forest.
| Feature | Blue chaffinch (Fringilla teydea | Common chaffinch (Fringilla coelebs) |
|---|---|---|
| Male colour | Slate- to steel-blue | Pink-brown breast, blue-grey crown, white wing bars |
| Female colour | Dull grey-brown | Olive-brown, plainer |
| Bill | Heavy, deep, thick-based | Slim, pointed, smaller |
| Size | Noticeably larger | Standard finch size |
| Distribution | Confined to Canary pine forest | Widespread across habitats |
The heavy bill is functional. It is designed for a single task: extracting seeds from the cones of the Canary Island pine. That dietary specialisation explains why the bird lives precisely where it does. Its range is the range of Pinus canariensis.
The pine-forest bond
The Canary Island pine is itself an unusual tree. It resprouts vigorously after fire — a trait rare among pines — and its needles condense moisture from the cloud layer that sits over the mid-elevation slopes for much of the year. The tree can survive on almost no summer rain, living off the water it combs from the air. That adaptation allowed a pine forest to establish on Tenerife’s north-facing slopes where other trees could not, and it created the habitat the blue chaffinch now depends on.
The bird returns the favour in no visible way. It is not a pollinator or a significant seed disperser; the heavy cone of Pinus canariensis relies on heat and time to release its seeds, not on animal transport. The blue chaffinch is a consumer, pure and simple. It takes pine seed as its staple, and it takes insects — particularly caterpillars and beetles — when feeding young. But the relationship is asymmetrical. The bird needs the tree completely; the tree does not need the bird.
That dependence makes the species intrinsically vulnerable. The blue chaffinch lives on one island, in one forest type, at one altitude band. If the forest goes, the bird goes. Fire is the principal threat. The pine resprouts after burning, but a fire hot enough or frequent enough to kill the trees — or to remove the canopy across a large enough area — would remove the food supply and the cover the bird needs. Forest clearance and fragmentation have already done historic damage in the lower reaches of the bird’s range, and the pine belt that remains is broken by roads, visitor infrastructure and small settlements.
Where a visitor encounters it
The blue chaffinch is not a bird of the open caldera floor. A visitor walking the Roques de García circuit or standing at the Parador will not see one. The bird stays in the forest, and the easiest place to meet it is on the drive up. The picnic areas and car parks along the TF-21 between El Portillo and the cable-car base station at 2,356 m are reliably productive, particularly early in the morning before the road traffic builds. Birds at these sites are somewhat habituated to people and will forage close to parked cars, even hopping onto picnic tables.
That habituation is an uneasy thing. It makes the bird easy to see, which is good for the visitor and good for the bird’s profile as a conservation flagship. But it also means the birds are exposed to dropped food, crumbs and intentional feeding. Do not feed them. The seeds of the Canary Island pine are what they need, not bread or crisps. Feeding changes behaviour, concentrates birds in unnatural numbers at a single site, and can spread disease.
The pine forest itself is worth the slower drive. On the north side of the mountain, the trees grow tall and dense, their long needles drooping in a way that gives the canopy a soft, grey-green texture. On the south side, the forest thins and the trees are shorter, more wind-bent, but the birds are there too. The blue chaffinch is present throughout the pine belt, not concentrated in a single reserve or viewpoint.
The other blue chaffinch
There is a species on Gran Canaria that shares the common name. Fringilla polatzeki, the Gran Canaria blue chaffinch, was long treated as a subspecies of the Tenerife bird but is now recognised as separate. It is confined to a single patch of pine forest at Inagua, much smaller than the Tenerife population, and is considerably rarer. The two are similar in appearance — the Gran Canaria bird is slightly smaller, and the male’s blue is a little less intense — but they have been evolving independently since the islands separated, and they are not interchangeable. A visitor on Tenerife will not accidentally see the Gran Canaria bird. The reverse is more likely: a visitor to Gran Canaria might not see it at all.
Conservation in the forest
The blue chaffinch has been the subject of sustained conservation attention for decades. The work has focused not on captive breeding or translocation — though those have been attempted for the Gran Canaria species — but on managing the forest itself. That means fire-prevention measures, controlled burns, thinning of undergrowth, and the creation of firebreaks. It also means controlling the mouflon, the wild sheep introduced to Tenerife in 1971, which damages the pine understorey by grazing and trampling.
The bird is protected by law, and the national park designation gives its core habitat a layer of security that the lower forest lacks. But the blue chaffinch does not stop at the park boundary. The pine forest extends below the national park line, and those lower reaches are vulnerable to building, road construction and agricultural encroachment. The bird’s long-term survival depends on the forest’s integrity across its entire range, not just inside the park.
The pine forest itself is resilient. After a fire, Pinus canariensis sends up new shoots from the trunk and from underground roots within weeks. A burned slope can look green again within a year. But that resilience has a limit. If fires become too frequent, or the forest is fragmented enough that birds cannot move between populations, the recovery may not keep pace. The blue chaffinch is tied to mature trees producing cones. A young resprouting forest does not provide food.
Seeing it well
The bird is not shy, but it is not tame in any reliable way. It moves through the pine canopy in pairs or small family groups, dropping to the ground to take fallen seeds, then flicking back into cover. The best sighting conditions are the first two hours after dawn, when the birds are actively feeding and the light is good. Later in the day they become quieter, and the heat pushes them higher into the canopy.
A visitor who stops at one of the roadside picnic areas, sits still for ten minutes and keeps binoculars ready will almost certainly see one. The challenge is not finding the bird but distinguishing it from the common chaffinch. With the male there is no difficulty. The female requires patience and a look at the bill. If the bird is large and has a heavy beak, it is the one.
The encounter is a small piece of a larger story. The blue chaffinch exists because the Canary Island pine forest exists, and that forest exists because a volcanic island rose from the sea and caught the trade winds at just the right height. The bird is an accident of geography and ecology, a finch that learned to crack a pine cone and never left.