As pretty as they are cats are very bad for all our native birds! If we could only train them to eat only the introduced species like house sparrows and starlings! Of course, this comments is only valid in North America.....
My neighbor lets his cat live outside. Upsets me. They go after more than birds...little bunnies too. Aside from this...you caught the stalking posture just right. Love the very natural locale...vines and all.