An illustration of a Blackcap male (left) and female on a nest (right) by Henrik Grönvold
<bdi><a href="https://en.wikipedia.org/wiki/en:Henrik_Gr%C3%B8nvold" class="extiw" title="w:en:Henrik Grønvold"><span title="Danish illustrator (1858-1940)">Henrik Grønvold</span></a>
</bdi>
circa 1907 <div style="display: none;">date QS:P,+1907-00-00T00:00:00Z/9,P1480,Q5727902</div>–1908
<a rel="nofollow" class="external text" href="https://www.biodiversitylibrary.org/page/8993776">Birds of Great Britain and Ireland, Order Passeres, vol. I, plate 18</a>