Retz's helmetshrike, Prionops retzii at Raptors View Wildlife Estate, Limpopo, South Africa. : 無料・フリー素材/写真
Retz's helmetshrike, Prionops retzii at Raptors View Wildlife Estate, Limpopo, South Africa. / Derek Keats
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Retz's helmetshrike, Prionops retzii, from yesterday's walk. We have two species of helmetshrike on Raptors, the other one being the white-crested helmetshrike, Prionops plumatus. Retz' is easily recognised by its dark colours with a bright orange eye and red eye wattle, as well as bright orange-red bill. Retz's helmentshrikes are the only known host to the brood parasite, thick billed cuckoo in our area. Following Retz's helmentshrikes during the breeding season might be a good way to find thick-billed cuckoos. I managed to do this last year at Balule in Kruger National Park, and found the cuckoo, but did not manage to get a photo. I was hoping to be luckier this summer, but so far no such luck.There is still plenty of work to be done on the evolution and relationships of this group. However the genus to which both species belong, Prionops, probably arose around 17 million years ago during the Neogene period, with the split between Retz’s and white-crested occurring potentially around 5 million years ago. This is the time frame for a lot of modern bird diversification, so nothing surprising there. |
| 撮影日 | 2023-01-21 17:16:52 |
| 撮影者 | Derek Keats , Hoedspruit, South Africa |
| タグ | |
| 撮影地 | |
| カメラ | Canon EOS R5 , Canon |
| 露出 | 0.001 sec (1/1250) |
| 開放F値 | f/2.8 |
| 焦点距離 | 400 mm |