ye

teh feather is quite complex

it can only really evolve once

That's not quite true

Eyes in their complexity have evolved several different ways

other dinosaurs had things what weren't really feathers but more like spikes of protofeathers (basicly what baby chicks have)

feathers in there structure

eyes can evolve difrent ways but they are essentially difrent

in the topology and structure

feathers are more unlikely

what i mean is the exact structure

this is not a lizard

its the only remaining line of a sister group of lizards

its also a single genus

it is also the only surviving TRUE diapsid

Yeah I know Henry the Tuatara

ye

I've got a zoology degree from NZ so I know my native species quite well

tuatara scull

clearly a diapsid

(diapsid means it has 2 temporal holes on each side)

Yes

I know

komoto dragon

it lost the bottom bridge of the bottom apsid

Yeah I know, this change was also present in transition species from lizard to mammals

true

As well as a change in gait

And tooth changes

turtles are strictly anapsids but they evolved from diapsids

the 2 apsids closed

in the fossil records of turtles we see signs of one of the apsids

But you can't use a single retained feature to classify the species as being one thing or the other

You can use them to trace origins

wich is the point i made

turtles arent strictly diapsids but are still clasified as one in phylogenic clasification

You said birds are reptiles, that's not true. Birds are birds, birds evolved from dinos, but they are birds.

yes