Why does a cURL request return a percent sign (%) with every request in ZSH?

Why does a cURL request return a percent sign (%) with every request in ZSH?

curl command-line zsh

curl

zsh sleep assistance with loop

loops unix curl zsh

curl

curl + https://mail.google.com/mail/feed/atom = 401 Unauthorized

bash curl gmail zsh

curl

New to curl & terminal... getting : zsh: parse error near `}'

curl zsh

curl