Lunate bone Lunate bone The lunate bone (semilunar bone) is a carpal bone in the human hand. It is distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row carpal bones, which lie between the ulna and radius and the hand. The lunate carpal bone is situated between the lateral scaphoid bone and medial triquetral bone. The lunate is a crescent-shaped carpal bone found within the hand. The lunate is found within the proximal row of carpal bones. Proximally, it abuts the radius. Laterally, it articulates with the scaphoid, medially with the triquetral, and
Extra-pair copulation have longer tails. A similar pattern has been found for black-capped chickadees, in which all extra-pair males had higher rank than the within-pair males. But some argue that genetic benefits for offspring is not the reason females participate in EPC. A meta-analysis of genetic benefits of EPC in 55 bird species found that extra-pair offspring were not more likely to survive than within-pair offspring. Also, extra-pair males did not show significantly better ‘good-genes’ traits than within-pair males, except for being slightly larger overall. Another potential explanation for the occurrence of EPC in organisms where females solicit EPC is that the