The center of The Hortus Botanicus is a Semicircle, in that day it was full of blooming tulips in pots.
There was a small pond. Next to it I saw rhododendrons, anemones, Leucothoe fontanesiana, giant rhubarb.
In a distance I've found birds those were looking for something on the path. These were starlings or blackbirds ( I'm not sure). The cut trunks were set along the path, apparently for tired visitors.
There are many plants and trees growing in greenhouses of the Hortus. Some plant species are very rare, they have played a role in the history of the garden. As I learned the plant beds behind the Palm House hold many wild rose species. Unfortunately I couldn't see rose blooming in early spring
I think you've guessed the last one isn't a plant or to better say is a metallic 'plant'. It was laid at a cafe where I had lunch :))