The Black Jacobin is a striking and easily identified hummingbird at Luck's yard. Sexes are alike and they are both tuxedo wearers in black and white. There are only two Jacobin species in the world and the other species, the White-necked Jacobin is one of the commonest birds on the Ecuador camera. You can see the relationship. Unmistakable. This is Marcia Braga's shot.

The feeder crowded with some size comparisons here. You can see the Sombre to the right and the Jacobin body size is just smaller than that with a more prominent tail. The central bird here is the Black-throated Mango male. Also very close to the Sombre in size.

The Susu shot of the Blackjack (as they are known here). Note the white flank mark that continues nicely into the left and right lateral tail feathers. Making for an excellent overall formal featherwear.

The two black breasted hummers. The male Black-throated Mango in the upper left and the Black Jacobin again on the right. Size again very close. The male Mango has no white anywhere.

The tail fanned. We have all tried some shots for this and so far this shot from Marcia Braga defines it best. I think perhaps the full adult males, like in the related White-necked Jacobin, lack the terminal dark band here on the lateral tail tips. And I am still not convinced that Jacobins don't take two years to get that tail, though this does not necessarily mean they don't breed after the first year.

The even better tail fan. Also from Marcia. Perhaps the same Jacobin. We will look for some tails with no terminal band.

The floating black belly with curved beak. Wings almost invisible. Elegance.

The tail again in partial unfurling. Jacobins use their tails for sexual bonding flight and for threat. Flashy and impressive again.

The distinctive pattern of the Blackjack head to head on a Regua feeder in December.