Tag: nature journaling

Dermacentor variabilis

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Ticks are parasitic arachnids of the order Ixodida. They live by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. They’ve been around for a long time; the oldest known tick fossils are from the Cretaceous period, around 100 million years old.

I’d never heard of the American dog tick (or wood tick) till I brought one home on my neck last weekend. They mostly live east of the Rocky Mountains. Dermacentor variabilis is a three-host tick—the larva, nymph and adult all need to ingest blood.

Some ticks attach to their host rapidly, while others wander around searching for thinner skin, such as that in the ears of mammals. Mine was obviously still on the hunt for a good feeding site. Reading up on tularemia and Rocky Mountain spotted fever, I’m glad I removed it before it latched on!

Pholcus phalangioides

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I thought I’d learn a bit more about our most common spider, the ubiquitous daddy long-legs, also known as the cellar spider. As a synanthrope (an organism that lives near and benefits from humans and their environmental modifications), these spiders can be found on every continent in the world. They prefer the warmth inside human dwellings; daddy long-legs living outdoors can be found in the dimly-lit, calm environment of caves and in between rock crevices.

It takes about one year for these spiders to mature after they are born, and their life span can be two years or more post-maturity.

There is a common misconception that this spider’s venom is extremely dangerous but that their fangs are too short to pierce human skin. Neither statement is true. The fangs are longer (0.25mm) than the epidermis is thick (0.1mm); the venom has a negligible effect on mammals, including humans. So let’s put that urban legend to bed.

Phoca vitulina

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Annette and I drove up the coast a ways to join the Channel Island Nature Journalers for a windswept nature journaling session at Carpinteria. (Note to my Australian friends: the emphasis is on the penultimate syllable, Car-pin-ter-REE-a) A good (blustery) time was had by all.

Alaus oculatus

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There are over 9000 species of click beetles worldwide, and over 900 species in North America alone.

This family is characterized by the unusual click mechanism on the beetle’s underside. A spine on the prosternum can be snapped into a corresponding notch on the mesosternum, producing a violent “click” that can bounce the beetle into the air. Clicking is mainly used to avoid predation, although it is also useful when the beetle is on its back and needs to right itself. See some close-ups and slow motion video here.