From Reddhole:
I have canine length and strength data for western coyotes and black-backed jackals. One male and one female were used for each species, provided specimens were available. Unfortunately, we do not know for sure if this was the case for these two species. See "CL" below. The figures are logarithmic, but the converted raw figures for upper canine length are as follows:
Coyote 1.98 cm
Black-backed jackal: 1.57 cm
The canine strength values are as follows (logarithmic) - higher means stronger canines:
Anterioposterior canine bending strength ("Sx") - Reflects upper canines ability to resist struggling prey mostly
Coyote: .010
Black-backed jackal: -.232
Mediolateral canine bending strength ("Sy") - Reflect upper canines ability to withstand force of bite more
Coyote: .216
Black-backed jackal: -0.014
However, the coyote skulls was likely larger as the average skull length was 16.37 cm vs. 14.09 cm for the black-backed jackal.
The following study measures total canine size (i.e. area) as a function of skull length. Bigger canines are highly correlated with big game hunting in wild canids vs. canids that take smaller prey. This is shown by "C1", which is a measure of the square root of canine size divided by condylbasal skull length. Larger numbers are found with wolves, AWDs, dholes and bush dogs. The figures are as follows:
Coyote: 0.40
Golden jackal: 0.38
The coyote also has stronger mechanical advantage of its jaw muscles, which means it has a stronger bite given the same amount of jaw muscles. This is shown by MAT and MAM below for the temporalis (more for powerful killing bite) and masseter (more for grabbing bite):
MAT:
Coyote: 0.245
Golden jackal: 0.242
MAM:
Coyote: 0.407
Golden Jackal: 0.383
However, the golden jackal has a slight advantage in jaw strength, which tends to correlate with bite force, around the carnassial:
Coyote: 0.48
Golden Jackal: 0.49
However, overall both species group closer together than with the big-game killing canids (i.e. wolves, dholes, AWDs, bush dogs).
MAM:
However, in general the coyote and jackal overlap
Как я понимаю, это о челюстях койота, обыкновенного и чепрачного шакалов.
ArgusEye, могли бы вы сказать, что именно написано в этой статье?
Голосование
