If we gently slope upwards the Teide, vegetation changes little by little with the altitude. Forests composed with Canarian Pine (Pinus canariensis), endemic three needles species very resistant against fire, shelter arboreal species. The Canary Islands Goldcrest (Regulus teneriffae) is very difficult to observe, first due to its small size, and above all because it moves nervously and rapidly along the tree trunks and in the shade. Without cryptic plumage, it is easily mistaken for the paler bark of the Canarian Pines. It differs from the Goldcrest by its black forehead, tertial tips less white and flanks slightly darker. Its tiny high-pitched calls sometimes allow locating it in a branch. Those is in the picture let me about fifteen seconds for photographing it! I found it at about 2,200 metres of elevation in volcano slope.