diff --git a/src/core.clj b/src/core.clj
index 0250df6..2d78aa7 100644
--- a/src/core.clj
+++ b/src/core.clj
@@ -72,15 +72,24 @@
     (add-observations birds now)
     {:status 200}))
 
+(add-observations [{:bird "Botaurus stellaris" :certainty 0.9}] (now))
+
 (defn summarise-species [user-id s]
-  (let [bird (:bird (first s))] 
+  (let [bird (:bird (first s))
+        {first-seen :min last-seen :max}
+        (reduce (fn [l r]
+                  (print l r)
+                  {:max (max (:max l) r) :min (min (:min l) r)})
+                {:min Integer/MAX_VALUE :max Integer/MIN_VALUE}
+                (map #(.toEpochSecond (.atZone (:time %) (java.time.ZoneId/of "Europe/Berlin"))) s))] 
     {:bird bird
      :certainty (apply max (map :certainty s))
      :count (count s)
      :nearby (get-nearby bird)
      :unseen (not (every? #(contains? (:seen-by %) user-id) s))
      :rote-liste (get-in conservation-info [(:latin bird) :status])
-     :first-seen (apply min (map #(.toEpochSecond (.atZone (:time %) (java.time.ZoneId/of "Europe/Berlin"))) s))}))
+     :first-seen first-seen
+     :last-seen last-seen}))
 
 (defn summarise-observations [observations user-id]
   (->> observations
@@ -150,7 +159,9 @@
                              count :count
                              nearby :nearby
                              concern :rote-liste
-                             unseen :unseen}]
+                             unseen :unseen
+                             last-seen :last-seen
+                             :as observation}]
   (let [observation-count (:observation-count nearby)]
     [:li.closed
      {:onclick "onExpand(this)"
@@ -175,7 +186,13 @@
      " "
      (template-concern (if (contains? template-concern concern) concern (:iucn bird)))
      [:div.info {:style "display: none;font-size: 0.8em;"}
-      (str (or observation-count "no") " nearby observations")]
+      (str (or observation-count "no") " nearby observations")
+      [:br]
+      [:span.last-seen "Last seen: " (.format (.atZone (java.time.Instant/ofEpochSecond last-seen)
+                                                       (java.time.ZoneId/of "Europe/Berlin"))
+                                              (.atZone (java.time.Instant/ofEpochSecond last-seen)
+                                                       (java.time.ZoneId/of "Europe/Berlin"))
+                                              date-formatter)]]
      [:br]
      [:span.certainty
       {:style (str
@@ -186,7 +203,9 @@
                        0.8 (str "color:" (:orange colours) ";")
                        0.5 (str "color:" (:light-orange colours) ";")
                        nil)} (double (/ (math/round (* 10000 certainty)) 100.0))]
-      " %"]]))
+      " %"]
+     [:br]
+     ]))
 
 (defn filter-outdated [since obs]
        (filter #(.isBefore since (:time %)) obs))