diff --git a/src/fellchensammlung/models.py b/src/fellchensammlung/models.py
index f556441..ca6fe39 100644
--- a/src/fellchensammlung/models.py
+++ b/src/fellchensammlung/models.py
@@ -2,6 +2,9 @@ from django.db import models
 from django.urls import reverse
 from django.contrib.auth.models import User
 from django.utils.translation import gettext_lazy as _
+from datetime import datetime
+
+from fellchensammlung.tools import misc
 
 
 class Image(models.Model):
@@ -61,18 +64,39 @@ class RescueOrganization(models.Model):
 
 
 class Animal(models.Model):
-    def __str__(self):
-        return f"{self.name}"
+    MALE_NEUTERED = "M_N"
+    MALE = "M"
+    FEMALE_NEUTERED = "F_N"
+    FEMALE = "F"
+    SEX_CHOICES = {
+        MALE_NEUTERED: "male_neutered",
+        MALE: "male",
+        FEMALE_NEUTERED: "female_neutered",
+        FEMALE: "female",
+    }
 
-    def get_absolute_url(self):
-        """Returns the url to access a detailed page for the animal."""
-        return reverse('animal-detail', args=[str(self.id)])
-
-    date_of_birth = models.DateField(null=True, blank=True, verbose_name=_('Date of birth'))
+    date_of_birth = models.DateField(verbose_name=_('Date of birth'))
     name = models.CharField(max_length=200)
     description = models.TextField(null=True, blank=True, verbose_name=_('Description'))
     species = models.ForeignKey(Species, on_delete=models.PROTECT)
     photos = models.ManyToManyField(Image, blank=True)
+    sex = models.CharField(max_length=20, choices=SEX_CHOICES, )
+
+    def __str__(self):
+        return f"{self.name}"
+
+    @property
+    def age(self):
+        return datetime.today().date() - self.date_of_birth
+
+    @property
+    def hr_age(self):
+        """Returns a human-readable age based on the date of birth."""
+        return misc.age_as_hr_string(self.age)
+
+    def get_absolute_url(self):
+        """Returns the url to access a detailed page for the animal."""
+        return reverse('animal-detail', args=[str(self.id)])
 
 
 class AdoptionNotice(models.Model):
diff --git a/src/fellchensammlung/static/fellchensammlung/css/styles.css b/src/fellchensammlung/static/fellchensammlung/css/styles.css
index 8da262a..f1b753e 100644
--- a/src/fellchensammlung/static/fellchensammlung/css/styles.css
+++ b/src/fellchensammlung/static/fellchensammlung/css/styles.css
@@ -282,3 +282,20 @@ h1 {
         -webkit-transform: scale(1, 1);
     }
 }
+
+.detail-animal-header {
+    border: 2px lavender solid;
+    border-radius: 5px;
+}
+
+.species {
+    display: inline;
+    border: darkgray 2px solid;
+    border-radius: 0.3rem;
+    background: aliceblue;
+    padding: 2px;
+}
+
+.inline {
+    display: inline;
+}
\ No newline at end of file
diff --git a/src/fellchensammlung/views.py b/src/fellchensammlung/views.py
index 121963a..d607209 100644
--- a/src/fellchensammlung/views.py
+++ b/src/fellchensammlung/views.py
@@ -2,7 +2,7 @@ from django.shortcuts import render
 import markdown
 
 from django.http import HttpResponse
-from fellchensammlung.models import AdoptionNotice, MarkdownContent
+from fellchensammlung.models import AdoptionNotice, MarkdownContent, Animal
 
 
 def index(request):
@@ -18,8 +18,9 @@ def adoption_notice_detail(request, adoption_notice_id):
 
 
 def animal_detail(request, animal_id):
-    response = "You're looking at animal %s."
-    return HttpResponse(response % animal_id)
+    animal = Animal.objects.get(id=animal_id)
+    context = {"animal": animal}
+    return render(request, 'fellchensammlung/detail_animal.html', context=context)
 
 def search(request):
     latest_adoption_list = AdoptionNotice.objects.order_by("-created_at")[:5]