Featured species: those @#%$$%@#$&^!! geese again!
Large, high-altitude flocks of Canada Geese are passing through over the next half-month. These are mostly the Northern subspecies of the Canada Goose, Branta Canadensis interior (see Late October for a discussion of Goose subspecies).
Unlike our Giant subspecies, these birds have declined in population, only recently stabilizing at a fairly low level (roughly 100,000 birds). This has been mirrored by a rise in the population of Giants, and may be caused in part by increasing numbers of Giants flying up to James Bay to moult, and competing with the nesting Northerns and their goslings for scarce food. This has been exacerbated by the destruction of salt marsh habitat by large numbers of Snow Geese, on the increase because of heightened food production in the U.S. Midwest. Everything is connected.
- Bank and Cliff Swallows may have joined the Tree Swallows in competition for all those midges.
- Other late April arrivals include Broad-winged hawks, Chimney Swifts and Eastern Towhee, while many of the diving ducks are departing for northern breeding grounds (Common Goldeneye, Ring-necked Duck, Bufflehead, Common Merganser).
- Both Woodcock and Wilson’s (or Common) Snipe males are putting on their dramatic flight displays. Here’s a good video of Woodcock on the ground, and one of the Snipe flight with a bit of the winnowing sound created by the tail feathers. Woodcock flight sounds are here (scroll down), along with an aerial display.
- Any dragonflies that you are likely to see will be migrant Common Green Darners, pushed north on warm southern winds (if any...).
- Turtles and Eastern Garter Snakes emerge from their winter sleep. Male snakes are first on the scene, waiting for receptive females. When one appears, males fall on her in a writhing mass, but only one lucky male gets to impregnate her, leaving behind a plug of gelatin in her vent.
- In a normal year, Leopard and Pickerel (a bit later) Frogs join the amphibian chorus in nearby ponds and wetlands. Keep an ear out.
- Northern Pike move into weedy shallows and flooded marshes to spawn (at 4 – 11oC), followed soon after by Muskellunge (9 – 15oC). Both fish are easily visible by foot or canoe.
- Just as they were the last to drop their leaves, city-bred, non-native trees are often the first to leaf out. Check the buds on Norway Maples and other introduced species. Among natives, Red-berried Elder is among the first to leaf.
- Farmers are out in the fields, and if conditions are dry enough, will begin to plant hard corn, oats and spring wheat by the end of the month.
- Maple syrup production has been fairly good this year, with quite cold weather slowing the process in some regions. Increasing day length and sun intensity may cause budding and end the season in some areas before rising temperatures do. Get the latest production report here and here
- As of early April, colder weather has hemmed in Monarch Butterflies, keeping them huddled in the deeper south. These are still the butterflies that overwintered in Mexico, and are now laying eggs on fresh Milkweed plants. It’s the next generation that will push its way north to us. Get ready to report your sightings later this spring.
- This year, as of mid April, the closest Ruby-throated Hummingbirds are in north central Indiana, and most are much farther south, still holding below the Mason-Dixon Line. They arrive in southern Canada generally in early to mid-May (but occasionally in late April), so keep your eyes peeled and your feeders ready. You can also learn more about hummingbird territoriality and mating.
- Remember, the Lyrids meteor shower can be seen peaking to the northeast before dawn on April 22nd. It has been observed for over 2600 years, but is generally weak (10-20 meteors/hour), with occasional years of higher frequencies. The locus, or radiant (scroll down) for this shower is between the star Vega and the constellation Hercules, and points back toward the constellation Lyra. This shower is caused by the debris trail of the comet Thatcher, and is best viewed after midnight and before sunrise from the 16th through the 25th. However, you can often see the odd Lyrid meteor before midnight, with little interference from a crescent moon. The comet was named in 1861, but won’t return until 2276.
- Mercury is farthest from the sun in late April, and will be visible before dawn. It will be easy to see in the Southern Hemisphere but harder in the Northern. Why? It’s all about the ecliptic.
- The moon meets up with Jupiter, to the east after sunset on the 30th.