You are here

Use register_post_type() to modify an existing post type

function wp1482371_custom_post_type_args( $args, $post_type ) {
    if ( $post_type == "animal-species" ) {
        $args['rewrite'] = array(
            'slug' => 'animal'
        );
    }
    return $args;
}
add_filter( 'register_post_type_args', 'wp1482371_custom_post_type_args', 20, 2 );
code type: 
Taken from: 
https://wordpress.stackexchange.com/questions/65075/use-register-post-type-to-modify-an-existing-post-type