This Week's Catch

[Lava Lamp]

Here's this week's catch. Each with a D50 and Sigma 50-500mm. Your thoughts, comments, and suggestions appreciated.

[McMadCow]

I feel a little underqualified to comment on nature photography, but I really like the third one a lot. The detail is amazing, and I love the colors and contrasts. I'll give a slight nitpick about the blown-out feathers to the left, though. The pure white/no detail just doesn't look natural in the shot.
Great work, and shanks for sharing these!