shell

So this little bag of chips that I got from Paris and this mini shell that he really likes.

They also do have corporate sponsors like Boeing, Philip Morris, and Shell.

Exposure to the DDT was causing the birds to lay eggs with much thinner egg shells, leading to fewer eggs surviving long enough to hatch.

Like, to study turtle populations with the mark and recapture method, an ecologist might put a small notch in their shells, or for butterflies, label the wing with a permanent marker.