diff --git a/gerbil-manager-web/src/pages/GerbilsPage.tsx b/gerbil-manager-web/src/pages/GerbilsPage.tsx
index 36e5516..79d3ceb 100644
--- a/gerbil-manager-web/src/pages/GerbilsPage.tsx
+++ b/gerbil-manager-web/src/pages/GerbilsPage.tsx
@@ -1,12 +1,13 @@
 import { useMemo, useState } from 'react'
 import { Link } from 'react-router-dom'
 import { de } from '../strings/de'
-import { listGerbils } from '../api/gerbils'
+import { listGerbils, updateGerbil } from '../api/gerbils'
 import { listColorVarieties } from '../api/lookups'
 import { andFilter, condition, type GridifyQuery } from '../api/gridify'
 import { GENDERS, GERBIL_STATUSES, type Gender, type GerbilStatus } from '../api/types'
-import { useApi } from '../hooks/useApi'
+import { useApi, useMutation } from '../hooks/useApi'
 import { formatDate, genderLabel, statusLabel } from '../format/labels'
+import './gerbils.css'
 
 const PAGE_SIZE = 20
 
@@ -64,6 +65,26 @@ export default function GerbilsPage() {
   const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
   const items = gerbils.data?.items ?? []
 
+  // Multi-select bulk "Zur Abgabe stellen".
+  const [selected, setSelected] = useState<Set<string>>(new Set())
+  const toggleSelect = (id: string) =>
+    setSelected((prev) => {
+      const next = new Set(prev)
+      if (next.has(id)) next.delete(id)
+      else next.add(id)
+      return next
+    })
+  const bulkForSale = useMutation((ids: string[]) =>
+    Promise.all(ids.map((id) => updateGerbil(id, { status: 'ForSale' }))),
+  )
+  async function markSelectedForSale() {
+    const result = await bulkForSale.run([...selected])
+    if (result.ok) {
+      setSelected(new Set())
+      gerbils.reload()
+    }
+  }
+
   return (
     <section className="page">
       <header className="page-head">
@@ -159,10 +180,34 @@ export default function GerbilsPage() {
         <p className="muted">{t.empty}</p>
       )}
 
+      {selected.size > 0 && (
+        <div className="bulk-bar">
+          <span>
+            {selected.size} {t.countLabel}
+          </span>
+          <button
+            type="button"
+            className="btn btn--primary"
+            disabled={bulkForSale.pending}
+            onClick={markSelectedForSale}
+          >
+            {de.pages.abgabe.markMultiAction}
+          </button>
+          {bulkForSale.error && <span className="error-text">{bulkForSale.error}</span>}
+        </div>
+      )}
+
       {items.length > 0 && (
         <ul className="card-list">
           {items.map((g) => (
-            <li key={g.id}>
+            <li key={g.id} className="gerbil-row">
+              <input
+                type="checkbox"
+                className="gerbil-row__check"
+                checked={selected.has(g.id)}
+                onChange={() => toggleSelect(g.id)}
+                aria-label={g.name}
+              />
               <Link to={`/rennmaeuse/${g.id}`} className="gerbil-card">
                 <span className="gerbil-card__name">{g.name}</span>
                 <span className={`badge badge--${g.status.toLowerCase()}`}>
diff --git a/gerbil-manager-web/src/pages/gerbils.css b/gerbil-manager-web/src/pages/gerbils.css
new file mode 100644
index 0000000..bf03b52
--- /dev/null
+++ b/gerbil-manager-web/src/pages/gerbils.css
@@ -0,0 +1,33 @@
+/* FEAT-12a multi-select on the Tiere list — page-scoped. */
+
+.gerbil-row {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+}
+
+.gerbil-row__check {
+  width: 1.25rem;
+  height: 1.25rem;
+  min-height: 0;
+  flex: 0 0 auto;
+}
+
+.gerbil-row > .gerbil-card {
+  flex: 1;
+}
+
+.bulk-bar {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  flex-wrap: wrap;
+  padding: 0.6rem 0.9rem;
+  margin: 0.5rem 0;
+  border: 1px solid var(--color-accent);
+  border-radius: 0.5rem;
+  background: var(--color-accent-soft);
+  position: sticky;
+  top: 0;
+  z-index: 1;
+}