I recently discovered Nature Blog Network, which bills itself as "a resource for the very best nature blogs on the net." You can sort through member blogs by topic, such as ecosystem (that's where I put Mama Joules), marine, birds (a very popular topic, I learned), mammals, mollusks (three snail blogs at the time of this writing), and flora (plants & trees).
I'm still picking my way through the listings, but I have a couple of early favorites. Ugly Overload is a nice compliment to Mama Joules' Weird Animal Names. Ugly Overload is just what it says -- a website for strikingly ugly animals (with great pictures). According to their website, Ugly Overload is for "giving ugly animals their day in the sun." Check out the entry from May 22, 2008 on Insects and Friends about giant live beetles found unexpectedly in a package at the post office!
I also liked the photographs at tHE tiDE cHAsER, especially the close-ups of sea life. And be sure to check out Bill of the Birds and his giant Goudasaurus!