YESC Greater Seattle Bioblitz '20-'21's Boletim

Arquivos de periódicos de fevereiro 2021

02 de fevereiro de 2021

Tracking : Prints

Answers to last week's track trivia!

Starting clockwise from top-left, we have squirrel, hare, deer, bobcat, and wolf.

Squirrel - Keys to ID: small size of prints, slightly oval in direction of travel

Hare - Keys to ID: four prints will be visible in each "set," but forepaws are often close together, looking like a single print. Hind paws will be larger than forepaws, and set ahead in the track set. This hare was moving from right to left.

Deer - Keys to ID: The prints of a deer are fairly distinct from non-hooved mammals. Notice the dewclaws (the two dots to the right of the print). The dewclaws will be visible in soft terrain or if the deer was running.

Bobcat - Keys to ID: Cat and dog (feline and canine) prints can look very similar. Cats will leave more circular prints, while a dog's print will be slightly oval shaped (stretched in the direction of travel). The small size of this print leads us to bobcat rather than lynx or cougar.

Wolf - Keys to ID: Come upon a wolf print and you'll have no doubt. Unless you are on a trail that domestic dogs frequently travel. The large size, presence of claws, and oval shape reveal this as a wolf track.

Simply knowing the fauna present in your region, and which species are abundant, helps narrow down your options significantly

Stay tuned for "Tracking: Patterns" to learn how to identify animal tracks simply by the pattern of prints left in the snow

Posted on 02 de fevereiro de 2021, 12:50 AM by rholmes925 rholmes925 | 0 comentários | Deixar um comentário

08 de fevereiro de 2021

Tracking: Patterns

Last week we looked at how to identify tracks an animal made by their print (the shape of their indent). We counted toes, looked for claw marks, and examined the shape of various tracks to help identify the animal that made them. This week, we will dive into track patterns , which are FASCINATING!

All land animals move. For those animals with four legs, most of them move in similar ways, albeit at different times and speeds. Track patterns look at the spacing and alignment of the various prints, rather than the prints themselves.

Diagonal Walkers

In this gait, the front-left and back-right feet (diagonal) will move at the same time. Often, the back feet land in the same space the front feet just vacated, making for a very efficient movement. Deer, dogs, and cats will move in this way.

Amblers

Their body shape and size make it easier for them to sway side to side. In the video, note how the bear will move its front-right and back-right feet at the same time, then the front-left and back-left feet. Other animals that move this way include skunks, beavers, and raccoons. The different gaits result in different track patterns

Bounders

Their front feet land first, quickly followed by their back feet just behind, often overlapping. This a common pattern for slim, long bodied animals like weasels, fishers, mink, and marten.

Gallopers

Animals like hares and squirrels use this movement by landing with their front feet first, then their back feet actually ahead of their front feet. Keep a close eye on the hare as it moves through the snow.

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Did you notice anything else? What gait was the lynx moving in when it was moving slowly? How about when it was chasing the hare at full speed? While many animals have a "standard" gait, most will use many different gaits while moving at different speeds. The above video is a great example of both animals changing gaits and sometimes using the same one.

This last video, midway down THIS PAGE, does a good job of showcasing the transition an animal makes as it moves through different gaits.

Finally, the below picture is a good representation of what these patterns might look like when you find them in the snow, dirt, or sand. Happy tracking!

Posted on 08 de fevereiro de 2021, 10:13 PM by rholmes925 rholmes925 | 0 comentários | Deixar um comentário

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