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He pointed to other examples of successful animal control programs, including trapping brown-headed cowbirds to benefit the least bell’s vireo, a small endangered bird.

But birds that are more sensitive to temperatures — and those whose prey can’t stand the heat — might suffer under persistent warming, such as yellow warblers and Bell’s vireos.

Once teetering on extinction, the least Bell’s vireo is making a comeback in areas along the Los Angeles River, including a bustling park in northeast L.A.

Once teetering on extinction, the least Bell’s vireo is making a comeback in areas along the Los Angeles River, including a bustling park in northeast L.A.

The arrival of warblers, vireos and other colorful birds last week has excited Britain’s twitching community — enthusiastic bird-watchers who will travel long distances to view new or unusual species.