Firstly, welcome
@Barwickbird I hope you enjoy the forum, it's a great place to learn both about birds and photography.
Now to the tricky questions...and this might seem a little out of left-field, but can I first start by asking how old is your Desktop / Laptop?...and I ask this because it's no good having the latest mirrorless camera if you don't have a computer and software capable of processing the latest high-res files at a reasonable speed.
Next...are you new to photography, or do you have a good understanding of what it takes to produce a good image...and please don't think this as being patronising because it's not meant in that way at all, I'm just trying to get a sense of your skill level in terms of photography.
As for kit...some good advice has already been given above and the R7 is a good shout if you want to go with Canon and mirrorless, though I wouldn't rule out a good DSLR just yet, all the images in my gallery were taken with a DSLR which should give you a good idea of what can still be achieved with dinosaur kit
Hope this is of some use