The Avalanche Bridge, launched last August, has facilitated over $50B in transfers between Avalanche and Ethereum. Today, the Ava Labs team has added support for the Bitcoin network. Users are now able to transfer Bitcoin to Avalanche C-Chain with in a cheap, seamless manner without having to go through Ethereum. We plan to enable wide adoption of BTC.b across the Avalanche and other ecosystems.

Full press release: https://medium.com/avalancheavax/avalanche-bridge-adds-native-bitcoin-support-6306236fb506
Support articles: https://support.avax.network/en/articles/6081464-core-extension-how-do-i-bridge-bitcoin-btc