Dad Bods of the animal kingdom: Polar bear

Photo: © Howard Buffett/WWF-US

From enthusiastic affirmations to groaning facepalms, the discussion of "dad bods" has elicited quite a response from the Internet.

With Father's Day just around the corner, let's turn the camera away from humans and take a look a more serious look at how "dad bods" look in a variety of mammalian species around the world.

Let's kick it off with polar bears because the males are so much bigger than the females,  a trait that's called sexual dimorphism.

While female polar bears range in weight from 400 to 700 pounds, males are generally twice or even three times that size. The average weight of a mature male polar bear is around 1,000 pounds, but some individuals have actually been known to tip the scales at a whopping 2,000 pounds.

Continue below to learn more about sexually dimorphic mammals, with images provided by World Wildlife Fund.

Dad Bods of the animal kingdom: Orangutan

Photo: © naturepl.com/Anup Shah/WWF

Orangutans are a highly sexually dimorphic species in relation to their size and facial features. In addition to boasting a body mass that's often more than twice that of females, dominant male orangutans also sports flanged cheeks and a pendulous throat sack used to call out for mates.

While these are fascinating characteristics, they are not exhibited in all sexually mature male orangutans. That's because male orangutans also display bimaturism, meaning they may have delayed development depending on their social surrounding. Within the male sex, there are two distinct body types — the dominant flanged male already described and a smaller, non-dominant unflanged male (like the one pictured above).

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Dad Bods of the animal kingdom: Warthog

Photo: © Martin Harvey/WWF

Male warthogs are a bit larger than their female counterparts, but what really sets them apart are their facial features. Although female warthogs do have protruding warts and tusks, the ones found on a male are significantly more pronounced and ornamental.

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Dad Bods of the animal kingdom: Lemur

Photo: © Martin Harvey/WWF

Unlike polar bears and orangutans, lemurs (like the Sifaka lemur hopping around in the photo above) are not dramatically different in size, though males are sometimes a tiny bit larger than females. Instead, many lemurs exhibit a dimorphism related to their fur coloration.

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Dad Bods of the animal kingdom: Panda

Photo: © Bernard De Wetter/WWF

Giant pandas tend to have a relatively uniform coloration across the board, so if you stood in a room full of pandas (lucky you!), you might have trouble telling them apart. However, if you had a discerning enough eye, you could probably manage to at least identify the sex of them based on their size. Males tend to be heavier and taller.

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Dad Bods of the animal kingdom: Chimpanzee

Photo: © naturepl.com/Andy Rouse/WWF

As the closest living relative to humans, it should come as no surprise to learn that chimpanzees share many of the same traits that distinguish male humans from females, most notably in relation to body mass.

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Dad Bods of the animal kingdom: Hippopotamus

Photo: © Martin Harvey/WWF

Hippopotamuses are not dramatically different between the sexes, but there are a few minor differences. In males, the tusk-like lower canine teeth are generally longer and the muzzle and jowl area on the face is larger and more pronounced.

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Dad Bods of the animal kingdom: Mountain Gorilla

Photo: © naturepl.com/Andy Rouse/WWF

Like many other large apes, sexual dimorphism in gorillas is exceptionally pronounced. Wild male gorillas weigh in between 300 and 400 pounds, while the average weight of wild female gorillas ranges between 150 and 250 pounds.

Their fur coloring (like that of a large alpha silverback) can sometimes indicate their rank within a social grouping. However, this has less to do with delayed physical development and more to do with their seniority and age. All males eventually get the silver on their back if they live long enough, and by the time that happens, they have often graduated into the de facto status of group leader.

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Dad Bods of the animal kingdom: Manatee

Photo: © naturepl.com/Alex Mustard/WWF

Unlike the rest of the animals listed in this [by no means comprehensive] list, female manatees actually come out on top in the size category. That said, even though females tend to be bigger, it's still quite difficult to determine a manatee's sex without taking a look and the underside.

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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.

Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.