Chickens can glitch through half slabs.
See http://youtu.be/a3R6sZNPBqY for a clip of what I mean.
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in this video I used 1.4.5 prerelease (the version that Mojang released last week)
I have not recorded any other examples of glitching chickens but the chickens glitch through water and so on. It makes it quite difficult to have a self sustained egg farm. I have had clitchy chickens since version 1.2

Duplicate of MC-1836 , please use the search function to see if your bug has already been submitted. Currently over 30% of tickets are being closed as duplicate.

Please close this one...

@unknown this is already resolved, issues don't get closed normally, only under certain conditions
What versions have you tested on? Do you have a video that compares 1.4.4 and 1.4.5 prerelease, side by side? If not, I don't know what Minecraft version your video is showing.