The feathers change colour to match whatever surface they're on, but this stops happening within a few minutes and they settle on a neutral sort of grey-brown. 

Aw. Oh well. 

When the bird is done cooking she tears off a drumstick, hands the rest to Wilbur, and takes a crunchy bite out of the drumstick, bone and all 

It tastes weird but not bad, per se. There are probably more of them around in the trees, if either of them is still hungry. 

She ate like a whole herd of wild boar before they found the cultists or she'd've eaten all the predator-creatures straight off. 

And between a leg of predator-creature and all-but-a-drumstick of bird Wilbur is good for now, being much much smaller than his sister. 

Wilbur settles down to watch the fire. 

While Lucy, who is much more difficult to hurt, takes off to do some scouting and see what if anything she can find out about this place they've been sent. 

It does not get less creepy on further exploration. Hanging from a very large old-looking tree are vines that open worm-like mouths and try to eat her (without much success). At one point she runs into a creature sort of like a lion, but larger and with unnaturally long teeth. It looks at her from the top of a rock, seems to decide she's not worth bothering, and then turns partially invisible and creeps away. 

That is definitely a good choice for the lion. 

What's the highest up she can get? 

The rock is pretty tall, but her best bet is probably going to be one of the trees. The really tall ones don't have any branches until thirty feet up, though. 

This is a problem she is capable of solving with tentacles. 

Then, if she can reach the very top of the tree, she'll see a forest that stretches out for quite a ways on either side, rolling hills of it with occasional breaks where trees have fallen. There isn't that much light left but the dying sunset comes from what's presumably the west. In the opposite direction, there's eventually a shadowy break in the trees that might be a river. Even further that way, the horizon might be something other than forest, but really it's getting too dark to tell.

Hmm. 

She returns to her brother and reports on what she's found. He has to sleep almost like a human, so he turns in not long after sunset. Lucy pulls a book out of the bookbag she had been carrying when they ran into the cultists and left with her brother while she did things like "kill bizarre back hunters" and "go exploring" and reads by firelight, keeping an ear open for anything that might want to disturb them in the night. 

Some unfortunate bearlike creature does emerge and try to take her down with its claws about an hour before dawn; other than that the night is uneventful. 

So unfortunate for the bearlike creature. How does it taste? 

Pretty good, actually! It's got lots of meat and fat on its bones, and the meat tastes almost normal. The bearlike creature does have feathers mixed in with its fur, which is a bit weird, but eh. 

What are these feathers like?

They're large and sturdy, a dull colour that blends with the fur, but come off surprisingly easily, and turn out to have sharp barbed bases; it looks suspiciously like perhaps the bear-creature can fling them if provoked. They don't do anything problematic to her now that it's dead, though. 

Ha, neat. She collects these feathers as well and before long has the hide off the bear and the bear divided into several sections, each small enough to cook on their little campfire.

Wilbur wakes to the scent of roasting meat and the sight of his sister contently sucking blood off her tentacles.

"Goodmorning. I see we received visitors in the night."

"Just the one. It was this huge bear."

"Same difference." Om nom bear breakfast.

Some sort of foxlike creature with a long tongue that has teeth on the end tries to steal some of the meat fast enough that they don't notice, but other than that they're left unmolested. 

Lucy notices the foxalike but not soon enough that it's worth the effort to chase it. 

She sets up a crude frame for curing the bear hide on and, after a moment's reflection, checks to see if the pack-things have hides that ought to be worth saving.

The hides have a somewhat disgusting rubbery texture under the scales, and half a day later they're starting to really stink. 

That'd be a no, then. 

She disrobes and turns into her large form and eats another few. She can't exactly get food poisoning, after all.

Assuming nothing unexpected happens, the two of them will spend the rest of the day working on the bear skin, trying to work out some kind of primitive shelter, ideally portable, and fending off further wild animal attacks.