I'm finding a lot of birding opportunities out behind my house here in the Sonoran desert of Arizona. I'm amazed at how many birds there are here, lots of hawks, owls, doves, quail, roadrunners, woodpeckers, bats, and a wide variety of smaller birds that I don't know enough to identify. This guy, in the distant mesquite tree, caught my eye today: I grabbed some images of this young hawk (I think it's a juvenile Coopers hawk). My longest lens is the 14-140, which I used here at 140mm, hand held, with the GX7... but these images required very extreme cropping. I can see using 300mm easily. I need a good birding lens if I'm to capture these beautiful animals (including the reptiles and such) more appropriately. I was able to work hand held with the 14-140 @ 140 fairly well, but I think that with longer focal lengths, I will need to resort to a tripod. My bodies are GX7, EP5, EM5, EPL5. I will likely use a tripod for shooting with very long focal lengths. Please advise on a native m4/3 good lens for this. I think > 200mm (> 400mm equivalent) is what I need. Perhaps the 100-300? Thanks, in advance, for your recommendations.