2818a
Zinos Petrel.
Not easy to separate from Feas at sea. The Zinos is smaller but unless you have a side by side comparison it's a difficult call. The Zinos underwing often shows more white but that is not always the case and can't be relied upon.
The bill of the Zinos is always noticeably smaller and more slender. I've seen many Zinos at sea over the years but would still be reluctant to call one without having a decent photo to refer to.
2818a
Zinos Petrel.
Not easy to separate from Feas at sea. The Zinos is smaller but unless you have a side by side comparison it's a difficult call. The Zinos underwing often shows more white but that is not always the case and can't be relied upon.
The bill of the Zinos is always noticeably smaller and more slender. I've seen many Zinos at sea over the years but would still be reluctant to call one without having a decent photo to refer to.