The endangered California least terns that nest on the old airfield at Alameda Point are well protected during their April to August nesting season. Fencing keeps people away from the 10-acre sandy nesting site, but it won’t stop other birds and mammals from getting to the eggs and the helpless chicks. Only a well-armed and outfitted predator management officer can effectively deter other animals.
Every year, the U.S. Fish and Wildlife Service hires a wildlife biologist from Wildlife Services, a division of the U.S. Department of Agriculture. Typically used for protecting crops and livestock, the agency is also hired to protect dozens of endangered species every year. The most recent field report available for Alameda Point is for 2019, obtained through the Freedom of Information Act.
The report describes a variety of methods used to deter or eliminate threats to the nesting terns. First, loud noises and bright flashes of light are fired from a gun to frighten away an avian predator, called hazing. Second, the wildlife biologist drives a vehicle toward an avian predator, another form of hazing. Third, predators are trapped. And fourth, as a last resort, the biologist is left with no other choice than shooting the predator with a shotgun or rifle or euthanizing.
The cypress trees in the wetland near the proposed DePave Park at Alameda Point have served as a safe and secure nesting site for Great Blue Herons for many years. This year is no exception, despite the trees having died and barely standing. On May 7, Audubon Society bird observer Dawn Lemoine counted 13 juveniles in the nests.
A Snowy Egret caught two Bay pipefish in quick succession along the shoreline next to the Hornet Soccer Field on Sunday, November 24. This sighting of the Snowy Egret catching a pipefish is evidence that eelgrass, a special status marine vegetation, is present in the harbor east of the ferry maintenance facility. Pipefish “do not wander far from the eelgrass bed where they were born,” according to Bay Nature magazine. Eelgrass is pipefish habitat, in part, because pipefish are able to avoid predators as their slender bodies blend in with the narrow blades of eelgrass. Continue reading “Bay pipefish indicates eelgrass in Alameda Point harbor”
Great Egrets are commonly seen wading along a shoreline, in marshes and wetlands waiting for fish to come near before catching them with a quick thrust of its bill.
Great Egrets primarily eat small fish. However, their diet can also include reptiles such as lizards, amphibians, birds, small mammals, shrimp, worms, dragonflies, beetles, water bugs, and grasshoppers.
This particular Great Egret decided to stroll into the old campground at Alameda Point in search of food. It walked slowly up to a Rosemary bush and stood there for about five minutes, occasionally making slight head movements, before plunging its head into the bush to catch a lizard.
After holding the lizard in its bill for a few minutes, it gulped down the lizard and proceeded very slowly to another bush.
Ospreys returned again this year to nest at Alameda Point’s Seaplane Lagoon. But midway through the rearing process, the female became the sole provider and protector of her three chicks, after the male became entangled in fishing line. Such osprey single parenting is unheard of.