These are birostris, but the same is being described for alfredi and cf birostris. Click for detail!
Who would have thought!
Turns out that Mantas can change their color.
And this not gradually over a long period of time but instead, within minutes! According to this paper, coloration may indicate their mood but perhaps also be linked to communication - whilst making visual species ID just a tad more difficult!
Fascinating - and great observation by Csilla Ari!