I took the sign-posted path into the Albufereta nature reserve. This led to three bird hides, overlooking dried up ponds, beds baked hard by the sun, strewn with rocks, barren.
But there were movements among the rocks, shapes only clear when viewed by telescope.
These are stone curlews, insect eaters that hide, camouflaged against bare ground, hunkering down on plantigrade feet to merge with the rocks.
These drawings were done with ink and water, then conte crayon and chalk pastel for the few colours, in the Stillman and Birns beta sketch pad.