The Runt

The runt in a litter, when there is one, is the smallest and sometimes the weakest pup. Their biggest disadvantage is that, because all the other pups are larger than them, they have a harder time competing for Mom’s milk. It turns out that getting one’s fair share of milk during the first 48 hours after birth is very important: only that very initial supply of milk contains colostrum which is loaded with antibodies which primes the pups’ immune systems, without which they could be more vulnerable to illnesses.

Indulged by Dad

In domestic dogs the runt may be ignored by the mother who focuses more on her healthier looking pups — it’s a form of natural selection. There is no reason to believe this is any different for coyotes, whose infant mortality rate is often 70% and more.

Like father, like son! Size and age don’t matter when you itch!

According to Dr. Margaret V. Root Kustritz, a veterinary theriogenologist (specializing in animal reproduction) the smaller size is due to their placement in the uterine horn during gestation — theirs is a poor implantation site. She says that small size is not due to being premature: all pups in a litter are fertilized at the same moment in time.

The littlest guy plays alone here. He’s energetic and very focused

So here is a little coyote runt whose small size compared to the rest of the litter really surprised me at first. It is about 2/3 the size of the others — a litter of all males! Cool! As I watched, this one was the only pup indulged by Dad — and he loved the attention when it came.

He’s the littlest guy in these photos

As it turned out, none of the other pups — size notwithstanding — had anything over this particular runt. Although small, scrawny and with obvious skin issues, this one is the most active, most focused, most inquisitive of the bunch, and the only one, as I watched, who spent a great deal of time alone, honing his hunting skills, possibly imitating what he saw his parents do. It will be interesting to watch his development in relation to his siblings as they grow up.

The littlest is off to the left

The larger siblings

The whole pup clan lined up for me!

2 Comments (+add yours?)

  1. Dan De Vries
    Jun 11, 2018 @ 03:48:40

    Wow! Amazing photos! Thanks Janet!

    Reply

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