There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
From the the frame, he's 1.15x thicker at the chest. I'd adjust it to 1.2x for distance. With adjustments and looking at body length without head, he is not much longer than her, maybe 1.07x. Length estimate is 160 kg and chest diameter estimate is 224 kg, averaging 192 kg. However, I think the female is longer than average (thus over 130 kg), I doubt BMW would be anywhere near 160 kg as the length estimate predicts.
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They are too far apart, but the male in the back for the worth of the frame is barely smaller. Meaning, he is likely significantly larger than the male closer to the camera.
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Male in the bear is 1.022x longer for what is on the frame. We could adjust it to 1.04x perhaps for distance. Looks to be 1.04x thicker (in the other photo) and we can adjust that to 1.06x. Length estimate for the back male is then 225 kg and chest estimate is 238 kg, averaging 232 kg. This is assuming the foreground male is 200 kg.
Bear:
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I only messed with chest diameter. From the frame, he is actually smaller than her but that is obviously due to how far away he is. This is a very hard to picture to measure from. All I can say is that from the distance he away from the camera, he is still matching the chest diameter of the female in front, as is probably 1.2-1.3x their thickness, so 400-500 kg based on a 227 kg female.