This is one of several marks in a stone for a change and had to be
zoomed in to x200 to see it more closely. This is obviously a
primitive bird with impressive wings. The right wing is indicated
in the picture on the left. The first third of the picture on the
right is probably the left wing of the animal capable of flight.
What is typical from today's perspective is the beak-shaped mouth,
which must have contained at least fine teeth, as shown in the
picture on the left. It probably lived on insects that were larger
at the time, such as beetles, smaller snakes, snails and worms,
which, in our imagination, probably had even larger dimensions in
the Cretaceous period than today. The legs and typical three-toed
claws are also clearly visible below, with which the ancient bird
was able to easily grab its prey.