diff --git a/run.jl b/run.jl
index 51bc2329d986d53cd040d702bb359658055ebed0..4dbf6d2b196ac136f49ed47895d74a1433dc2cc5 100755
--- a/run.jl
+++ b/run.jl
@@ -7,4 +7,4 @@ using Pkg
 Pkg.activate(".")
 using Persephone
 
-simulate()
+@time simulate()
diff --git a/src/analysis/analyse_nature.R b/src/analysis/analyse_nature.R
index d3b9be805a4d121e1c707ba0d18fddf84e6b0416..4629aa944b45a543406618bed70e74c5a4485f82 100755
--- a/src/analysis/analyse_nature.R
+++ b/src/analysis/analyse_nature.R
@@ -12,7 +12,7 @@ library(terra)
 
 autorun = TRUE ## automatically run all analyses?
 
-datadir = "results" ## "results" by default
+datadir = "test_results" ## "results" by default
 popfile = "populations.csv"
 indfile = "individuals.csv"
 mapfile = "landcover_jena.tif"
@@ -26,7 +26,7 @@ populationTrends = function() {
         mutate(Date = as.POSIXct(strptime(Date,format="%Y-%m-%d")))
     ggplot(data=popdata, aes(x=Date, y=Abundance, color=Species)) +
         geom_point() +
-        geom_smooth() +
+        ##geom_smooth() +
         scale_color_viridis_d() +
         theme_bw()
     ggsave(paste0(datadir, "/", population_output_file, ".pdf"), width=8, height=4)
diff --git a/src/nature/wolpertinger.jl b/src/nature/wolpertinger.jl
index f426ba85f630e3ff7d8cd86951cbfa11f1f394b4..f22abc6a8b14089224de464bf64c5079304702f5 100644
--- a/src/nature/wolpertinger.jl
+++ b/src/nature/wolpertinger.jl
@@ -47,5 +47,5 @@ newspecies("Wolpertinger",
            updatewolpertinger!,
            Dict("popdensity"=>1/10000,
                 "birthenergy"=>400,
-                "fecundity"=>0.02,
+                "fecundity"=>0.01,
                 "maxspeed"=>5))
diff --git a/src/parameters.toml b/src/parameters.toml
index d0032e310beaf2f3fd5182561e7f2a73f2140796..1f8a75b132f65cccd3e91d8c5f351f805caa606f 100644
--- a/src/parameters.toml
+++ b/src/parameters.toml
@@ -15,7 +15,7 @@ loglevel = "debug" # verbosity level: "debug", "info", "quiet"
 seed = 0 # seed value for the RNG (0 -> random value)
 # dates to start and end the simulation
 startdate = 2020-01-01
-enddate = 2020-01-31
+enddate = 2020-12-31
 
 [farm]
 
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000000000000000000000000000000000000..15fb6c9c136143ad1c8340a769504892c4b42498
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+## A short shell script to test the current development version of Persephone.
+
+if [[ -d "test_results" ]]
+then
+    rm -r test_results
+fi
+
+./run.jl -o test_results -s 1
+
+src/analysis/analyse_nature.R