I mostly want a photo. I do even tick several species that I have not technically "seen" because I noticed the bird only in a photo of another bird later

have only a handful of ticks without a photo and I do it only when the bird is really clear to ID - and it usually happens only in very specific circumstance be cause I am always birding with a camera in hand. My current "only seen" world list is:
- Thick-billed Lark - flew over the road in Western Sahara in a minefield, no way to pursue and stay alive
- Red Junglefowl - hid very quickly in a Oil Palm plantation in Malaysia, but Id is obvious
- Masked Crimson Tanager - from a bus in Ecuador
- Olive-backed Euphonia, Costa Rica, don't remember the circumstances
- Oilbird in flight in Ecuador forest at night, unmistakeable
- Common Buttonquail, Kenya - seen really well flying in front of the car for extended period time, wing pattern is unique
Also I tick birds that I only heard, but considering I am completely tone deaf, it really has to be an umistakable sound and it is mostly owls

- my audio only list is: Boreal Owl, Double-spurred Francolin, Southen Boobook, Australasian bittern, Spotted Crake, Spotted Owl, Barred Owl, Peruvian Thick-knee, Deser Owl, Western Screech Owl, Saw-whet Owl, African Wood-Owl, Great Blue Turaco, Black Cuckoo, Little Greenbul. I'd probably never tick a warbler just on sound, I just don't trust them to keep the script ...
EDIT: I would also like to repeat my encouragement for people to tick heard-only birds and spread this idea. Why? Because it is really good for the birds, in particular for the nocturnal ones!