Thursday, March 26, 2015

Duration of mates varies among waterfowl


Since the ponds have become ice free, pairs of mallards, Canada geese and other waterfowl have been swimming and preparing to nest. A pair of mallards and a pair of Canada geese have been swimming in a little pond I walk by daily. Are they the same pairs as last year? 

Both mallards and Canada geese usually arrive at their breeding grounds paired
The duration of relationships is not the same for all waterfowl or even all bird species. There are two main types of mating in waterfowl: monogamy and polygamy. 

Thursday, March 19, 2015

Skunk cabbage true to its name


Whether the winter is short or long, the first flower is a joyful sight--even if its name is skunk cabbage. The bright yellow flowers emerge before the leaves, so spotting them is easy if you look in the right places.

Swamps, bog edges, sloughs, moist forests, along streams and other wet areas are apt places to look for skunk cabbage. The plant grows in both sun and shade but it grows larger when in shady locations.

Skunk cabbage flowers emerge before the leaves

Thursday, March 12, 2015

Whiskers a sixth sense for mammals


How do seals hunt in murky water? How do cats prowl on moonless nights without bumping into everything? They can’t extend their legs like we do our arms to keep from bumping into objects in the dark. They need their legs to swim or walk so instead they have whiskers.

Each vibrissa on a dog's face can be linked to a specific location in his brain
While typically noticed on cats and dogs, all mammals have whiskers except for humans and monotremes (duck-billed platypus and echidnas). A man’s whiskers aren’t the same as a cat’s whiskers.

Thursday, March 5, 2015

Can you imagine having more than two eyes?


Most familiar to us are animals with two eyes. But some animals have more than two eyes--a spider has eight eyes, a lizard three eyes and sea stars have one eye on each arm.

A grasshopper has two compound eyes on the sides of its head, an eye behind each antenna and one eye in the middle of its forehead. What do grasshoppers see?

Can you find the grasshopper's five eyes? The obvious eyes are the two large compound eyes. The three other eyes are simple eyes--the small circles between each compound eye and antenna, and between the antennae and mouth.
Even more unusual is the horseshoe crab which has five small eyes on the top of its shell, two compound eyes on the sides of the shell, two eyes in the middle of its body and one eye spot under its tail. What does it see? 

Monday, March 2, 2015

When camouflage doesn't work


While out hiking last week, we spotted this snowshoe hare. With a lack of snow at lower elevations, the snowshoe hare's white pelage didn't provide any camouflage.