Yes - It detects web crawlers/bots. Right now it supports 175 bots. You can extend the list anytime :) It is very flexible!
Advanced Bot Detection & Notifier - Notifies you via email whenever particular bot visits - You can set particular both to target notification

Notification Bar Plugin Allows you to add a cool notify bar to your WordPress website. This plugins gives you an additional extended message feature which you can control by settings in the backend.
You need to upload the zip file to the add plugin option in the backend or you can ftp the plugin files to the wp-contents/plugins folders. Then you need to go to the plugins tab and activate the plugin.
Notification Bar Plugin can be used to create any number of notification bar and you can seamlessly use them on any page as you wish. You have full control. Here are some of the features of the Notification Bar Plugins