Here, these are bark peelings which the coelura collect for me.

The researchers conclude that Neanderthals must have dug holes in the ground, filled them with birch bark peelings and set fire to them before covering them over to prevent air from getting in.

In addition it was demonstrated that increasing the internal water stress increased the level of endogenous ABA in the phloem–cambial region of bark peelings and decreased the basipetal movement of [14C]IAA through branch sections.

I wasn't exactly certain how a mother eagle would go about giving flying lessons, so I improvised, using a clearing and a mound of bark peelings upon which I'd stand to toss the birds, one at a time, up into the air, watching as they hurtled upward, wings tucked, enjoying the ride.