Here's an out-of-textbook lesson for 2nd grade about animals (to complement lesson 6).
The worksheet is meant to be completed alongside the PPT, then I check the answers, then we finish up with a wordsearch (I made one and put it on the back. Just google wordseach generator). I'm at a boy's school and threaten push-ups if a student is caught doing the wordsearch during the PPT, and since I use a wireless clicker, I have fun busting students by putting a laser point on their paper (cue the student slowly looking up with dread).
I tried to be as engaging as possible, asking for input from students about animal behavior, telling stories etc, and they were pretty into it. I spliced things up with videos, though, so that it's not just a pile of vocabulary all at once.
If your delivery is quicker than mine, you might want to throw a couple bonus videos on the end, as there is no shortage of entertaining animal videos floating around the internet.
Wordsearch words: fin, gills, lungs, school, amphibian, reptile, crocodile, scales, bird, feather, wing, beak, migrate, mammal, and sweat.
For the worksheet, just click 'Print Preview' to make it the size of a full page.