Shane Gross / Black grouper (Mycteroperca bonaci) with Remora fish (Remora sp). Caribbean Sea off Gardens of the Queen National Park, Cuba.
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Peter Cairns / 2020VISION / RF- Gannet (Morus bassanus) mutual preening. Bass Rock, Firth of Forth, Scotland, UK, June. (This image may be licensed either as rights managed or royalty free.)
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Clay Bolt / Mound ants (Formica sp) tending to aphids (Aphidoidea sp) on Many-flowered stickseed (Hackelia floribunda). Bridger Mountain Range, Montana, USA.