Seals! That's one thing that was visibly NOT noticeable outside on the island. The beaches they passed on the outskirts of the island when approaching had seabirds, shorebirds, crabs and turtles, all sorts of wildlife - even a few manatees off the shore. But not a single seal seen, outside of this lake.
They notice that most of the seals have reddish marks somewhere on their fur. Just a little spot here or there, to Chimerical eyes. Many of the people sport the redfin tattoo - at least those who have it in a visible spot. A child that goes running by giggling has a smudged version on her arm, maybe she did that herself in marker.
A moment of observation shows that the people who aren't wandering amongst the seals are gathered loosely around an older woman, tall and slender, her hair gone to grey, but with a strength about her. Her redfin mark is proudly displayed on her chest, right below the hollow of her throat, where all can see it. She looks vaguely familiar...
"That is Mama Saoirse." Seamus offers helpfully. "Be POLITE." He advises.
A tall man stands at her side - they recognize HIM from the pictures with Janice. The redfin mark carved in his bicep is also a dead giveaway, though it didn't show up in the mortal pictures. She also is holding a small bundle that wriggles, a fat cocoa colored fist waving, and gripping one of the woman's fingers.