Linux:
export DISCORD_TOKEN=<your bot token>
export ANIMAL_CHANNEL_ID=<your animal channel id>
export CLIENT_ID=<your client id>
export GUILD_ID=<your server's id>
Windows (PowerShell):
$env:DISCORD_TOKEN = "<your bot token>"
$env:ANIMAL_CHANNEL_ID = "<your animal channel id>"
$env:CLIENT_ID = "<your client id>"
$env:GUILD_ID = "<your server's id>"