A 16-year project to observe sea-eagle breeding has spotted the first pair of eggs laid for the 2025 season. A project called EagleCAM monitors the nest and its resident pair of white-bellied sea eagles, and captured two eggs laid in an 80-hour period starting on July 4. The sea-eagle nest is in Sydney Olympic Park, more than 20 kilometres from the home of the namesake rugby league team on the city's northern beaches. The eggs are expected to hatch in about 40 days. Bird lovers tuning in to EagleCAM for the incubation period can expect to see both the male and female birds sharing time incubating the eggs and bringing food back to the nest for each other. Once the chicks start to poke their way through, they come into the world with no help from mum and dad. EagleCAM operator Birdlife Southern NSW monitors the nation's second-largest raptor, which has a wingspan of more than two metres, to gain insight into how the birds operate in the wild. "They both sit on the eggs - (the female) sits alone at night but they share duties during the day," Birdlife volunteer Judy Harrington told AAP. Ms Harrington has observed the sea eagles on the Parramatta River since before the 2000 Olympics brought humans closer to disturbing the birds. White-bellied sea eagles are considered vulnerable in NSW and human interference with their nests is one of the leading dangers to the population. "We don't interfere but we can watch them because occasionally they might be in trouble, get tangled in fishing line," Ms Harrington said. "By educating people we hopefully change their behaviours to help look after the birds with rubbish, fishing line and hooks."