Which species was removed from the federal endangered species list in 2003?

The Sacramento Splittail was removed from the federal endangered species list in 2003 due to various efforts that helped stabilize its population and improve its habitat conditions. This fish species, native to the Central Valley of California, had been recognized as endangered primarily because of habitat loss and changes in water management practices. However, conservation initiatives, including habitat restoration and improved water quality in its natural range, contributed to the increase in its numbers, prompting the decision to delist the species.

In comparison, the other species mentioned have continued to face challenges and remain listed for protection due to ongoing threats such as habitat loss, environmental changes, and competition with invasive species. This continued listing reflects the necessity for ongoing conservation efforts to protect those populations.