This specimen has been observed in Tobago several times over several days. At first glance, one might think that it is a hummingbird with a natural frontal hoopoe. In fact, the analysis of several shots brings an answer to this weirdness.
It is probably a very fine twig superficially encrusted on the back of the forehead. This foreign body ruffled the surrounding feathers, which bristle giving the appearance of a frontal hoopoe. It is indeed a very much alive male Amazilia Tobaci, despite this woody mini-implant.